The black caiman is one of the largest predators in South America, but still quite a bit smaller than the largest crocodile species, which can exceed 20 ft in length!From proper husbandry and habitat guidance, to articles on health concerns, diet, and extensive care guides, Reptile Guide is here to educate everyone on all things reptiles.
Reptile.Guide is the preferred educational source on reptiles favored by experienced herptologists and new owners alike. With hundreds of articles on everything pertaining to lizards, turtles, and snakes, our experienced team provides reliable and accurate content you can trust.
Reptile Guide is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Reptile Guide is also a Chewy affiliate partner.The largest alligator species is the black caiman (Melanosuchus niger) which can exceed 16 ft in length! (Tip: Read about the largest CROCODILE and the actual difference between crocodiles and alligators.)
Do alligators teeth show?
Both crocodiles and alligators have large, knife-like teeth that are easily seen from the side; however, only the top teeth are visible in an alligator because their upper jaws are wider than their lower jaws, making their bottom teeth disappear when their mouths are closed. It’s just the opposite with crocodiles!
Some caimans strongly resemble true alligators – with dark coloration and broad snouts – while others (particularly the dwarf caiman) look quite bizarre.
Have you ever found alligator teeth – in the wilderness or for sale at a souvenir shop? Leave a comment to tell us about your thoughts and experiences.
Reptile.Guide is not a veterinary website, nor should any of the reptile health information on our site replace the advice of a certified veterinary professional.
They first appeared during the Late Triassic period, roughly 200 million years ago. At that time, the planet was inhabited by various strange and often fearsome creatures, including giant reptiles known as dinosaurs.
Alligators are generally less aggressive than crocodiles but are also less trainable. Crocodiles tend to be more intelligent and can be trained to perform tricks, but they can also be very aggressive.
The difference in bite force between crocodiles and alligators is a major factor in their diet. Crocodile teeth are sharper, allowing them to feed on meat that contains more minerals.
Crocodiles have a large number of sharper teeth, better adapted for slicing flesh. Alligators have fewer, blunter teeth that are better suited for crushing bone. This difference is reflected in their respective bites. Suppose you’re trying to decide whether an alligator vs crocodile would make a better pet after being fascinated by their incredible bodies and abilities. Both animals are large and potentially dangerous, requiring much space and specialized care. Crocodiles are known for their skin, which can be used in the production of leather goods. As a result of these factors, many species of crocodiles are currently endangered. Conservation efforts are underway in many parts of the world to protect these unique creatures.Alligators are fascinating creatures. The Chinese alligator is found only in China and nowhere else, which is one of the reasons it’s endangered. The American Alligator can be seen throughout the southeastern United States, where there is an abundance of these types on land and water!
Both Crocodiles and Alligators belong to orders that include caimans, but they don’t have anything else in common besides their membership within this grouping!
Unlike many other animals, alligators have changed very little throughout their evolution. It is probably because they already had a successful body plan that allowed them to thrive in their environment, thus there was no need to evolve further.
Crocodiles likewise play an important role in their ecosystems, serving as predators and prey. In addition, both alligators and crocodiles are popular tourist attractions, which can bring much-needed revenue to local communities.The gators’ larger surface area allows them greater control over regulating fluids while swimming – a trait that comes in handy, especially near coastal areas where high salinity waters exist!
Also, alligators have thick layers of skin that help to protect them from being injured by their prey. Today, alligators can be found in wetlands worldwide, and they play an important role in maintaining the balance of their ecosystems.
American crocodiles (which live in warm waters) are often slate gray or white underneath – this provides them protection against predators since light doesn’t penetrate very far underwater!
When compared, the Alligator vs. Crocodile may both seem very similar, but some key differences exist. Alligators are native to North America, while crocodiles can be found worldwide! In this article we’ll deep-dive into their histories and all of their key differences.
Alligators are native to the United States, while crocodiles are native to Africa, Australia, and South America. Alligators are typically found in freshwater environments, such as ponds, lakes, and rivers.
Despite their reputation as fearsome predators, crocodiles are vulnerable to extinction. It is partly due to their slow reproductive cycle. Crocodiles take a long time to reach sexual maturity, and they only lay a small number of eggs at a time.You’ll also need to consider which type of climate you live in, as alligators do best in warm weather, while crocodiles prefer cooler temperatures. Ultimately, your best pet will depend on your preferences and lifestyle.They are both incredibly well-adapted to their environments and can live for decades. However, a few key differences between these two reptiles set them apart. So after having read this, which one would you rather encounter on a nature hike?Alligators and crocodiles are now in danger of disappearing and are at risk due to habitat loss, pollution, and hunting. In terms of this there is no difference between the crocodile vs alligator.
Are there crocodile fossils?
The fossils of true crocodiles were about 2.6 to 5.3 million years old. These fossils belonged to the saltwater crocodile, the largest extant species in the world today. Other fossils have been found as well, like those of Crocodylus thorbjarnarsoni.
Crocodiles would have been relatively small and inconspicuous compared to their gigantic contemporaries. However, they soon began to diversify and evolve into the many different species we know today.
How can you tell if an alligator tooth is real?
They are covered in a thick layer of white enamel, just like our own teeth. Unlike human teeth, alligator teeth are not flattened. Instead, they have more of a conical shape. If you look at any alligator (or crocodile), you’ll notice that not all teeth are the same size.
However, these two giant reptile species diverge in many more aspects other than their physical differences. Read on to uncover all there is to know about each of them, and how they differ from each other! Here we go: Crocodile vs Alligator. Also, we must not pollute their environment or hunt them for their skin or meat. If we work and act now, we can ensure that these fascinating creatures will be around for millions of years to come. The temperature of the eggs also affects the incubation period; if it is too hot, the eggs will hatch early, and if it is too cold, the eggs will not hatch at all.Color can be a quick way of differentiating between crocodiles and alligators. Crocodile species tend to have darker colors, with green being one of their most common hues.
Alligators and crocodiles are often thought of as dangerous predators, and while it is true that they can be dangerous, there is more to these animals than meets the eye.
Alligators are carnivores, and their diet consists mainly of fish, birds, and small mammals. They have very sharp teeth that are perfect for slicing through meat.They use their powerful tails for swimming and running. Similarily they are also good climbers and can even climb trees. Alligators are solitary animals that live in swamps, marshes, and rivers.
Within these two broad categories, there are several different subspecies of crocodiles. For example, the New World Crocodile can be further divided into the gulf coast subspecies and the Florida subspecies.
In this way, they play a vital role in their ecosystems’ cycle of life and death. As such, it is clear that these ancient reptiles play an essential role in keeping their ecosystems healthy and thriving.The New World crocodiles include the Caimans, native to Central and South America, and the crocodiles found in the southeastern United States. The Old World crocodiles include true crocodiles native to Africa, Asia, and Australasia.
It helps to maintain the delicate balance of the food web and ensure that all animals have enough to eat. Alligators and crocodiles also play an important role in decomposition. By eating dead animals, these creatures help to break down organic matter and return nutrients to the soil.This difference is due to the different shapes of their teeth. Alligators have teeth that are round and blunt, while crocodiles have teeth that are sharp and pointed. The shape of their snouts also affects the way these animals hunt. Alligators and crocodiles start the food chain, which makes them apex predators, and they have few natural predators. As a result, they have little fear of humans and will attack if they feel threatened. Moreover, both animals are equipped with sharp teeth and powerful jaws that can cause serious injury to human beings. They also have long tails that can deliver a powerful blow.In addition, alligators and crocodiles are major food sources for many other animals. As top predators, they help to balance the food chain and keep populations of other animals in check. The loss of these animals would have a devastating impact on the delicate balance of nature.Thank you for reading this article about the crocodile vs alligator! If you want to see these amazing creatures in real life, head over to read our post on Where to See Crocodiles in the Wild. When most people think of alligators and crocodiles, they probably envision a large reptile tanning on a river bank or floating lazily in the water. While these creatures may seem harmless, they can be quite dangerous. Crocodiles are found in more states than alligators because they tolerate lower temperatures. The American Crocodile thrives from 85-93 degrees Fahrenheit, but this is not the case for their counterparts across the oceans in India, where they reside in waters that measure around 78 ° F or less!These two species, alligators and crocodiles, play an important role in their ecosystems, and their loss would have a ripple effect on the animals that depend on them.
Alligators and crocodiles may look alike, but they’re quite different creatures. Alligator snouts are shorter and broader, while their crocodile counterparts have long, narrow prominences that stick out from the mouth like an extended tongue.At Animals Around The Globe, we believe in a world where humans and animals live in harmony. We want to show people the beauty of experiencing animals in their natural habitat. We are convinced that exciting experiences with animals create a sense of love and responsibility towards them. As a more developed species, we should build greater awareness around animals and take them under our protection.
Alligators are known to attack humans only when they feel threatened. Both alligators and crocodiles have sharp teeth that are perfect for tearing meat, but their jaws can easily break if they clamp down on something too hard.
Alligators and crocodiles play an important role in their ecosystems. As top predators, they help keep populations of other animals in check, preventing species from becoming too abundant. Alligators are often feared because of their size and power, but these animals have a long and fascinating history. Alligators first appeared on Earth almost 50 million years ago and are one of the oldest species still in existence today. Both alligators and crocodiles are keystone species, meaning they play an important role in their ecosystems. For example, alligators help keep certain fish populations in check, which helps maintain the health of wetlands.Crocodiles are also carnivores, and their diet is similar to alligators. They eat mostly fish but also reptiles and mammals. Both alligators and crocodiles have powerful jaws that can crush bone.
Alligators tend to be smaller than crocodiles, with a broader snout. Meanwhile crocodiles have a long and narrow snout. Alligators are typically greenish-black in color, while crocodiles can be greenish-brown, gray, or even orange.Alligators use their broad snouts to sweep through the water, hoping to surprise their prey. Crocodiles, on the other hand, use their narrow snouts to snap at fish swimming by. Alligators are shy by nature, while crocodiles are aggressive and territorial. Crocodiles often attack and eat other animals, including fish, birds, and mammals. They have even been known to kill humans. For example, alligator bodies tend to be shorter with broader heads, while their teeth are more serrated than those in crocs’ mouths. Alligators also lack outer toes on each foot, as some species do!Alligator eggs incubate for about 60 days, while crocodile eggs incubate for about 90 days. This is so because crocodiles are a larger species and need more time to develop.These animals typically hunt alone, although they have been known to cooperate to take down large prey. Ultimately, these reptiles are fierce predators that consume anything they can come across.These creatures look differently depending on where they live; one has eyes like rubies, while another appears green-colored due to its spotted coat coloration. Alligators and crocodiles may look similar, but there are a few key ways to tell them apart. One of the most obvious is their snouts. Alligators have much broader, U-shaped snouts, while crocodiles have narrower, V-shaped snouts. On top of physical hiding tactics like coloration for concealment purposes, some also employ an interesting strategy called countershading. This makes these creatures look clumsy when moved into sunlight but sleek if seen at night.So there you have it – the crocodile vs. alligator. Two apex predators that inhabit different parts of the world and yet are surprisingly similar in many ways. Both animals are ambush hunters with keen eyesight and powerful jaws.
Is A crocodile a dinosaur?
Crocodiles are not dinosaurs, but both crocodiles and dinosaurs came from the crown group Archosaurs. Archosaurs were reptiles that included birds, crocodiles, pterosaurs, and dinosaurs.
Crocodiles are the most iconic group of animals on Earth. While they may not look particularly different from their ancient ancestors, they have undergone a dramatic transformation throughout their evolutionary history.Over the ensuing millions of years, crocodiles have become some of the most successful predators on the planet, inhabiting every major continent except Antarctica. They have also come to occupy a wide range of different habitats, from rivers and lakes to swamps and marshes.
Both crocodiles and alligators are large reptilian predators with long snouts and sharp teeth. However, Crocodiles tend to be much larger than alligators, with the average Crocodile measuring between 15 and 20 feet in length.
These specialized cells, which are placed at the tips of each digit, allow for exquisite sensitivity when detecting ripples or changes within the water level. They also help these animals regulate how much salt is leaving the body through sweat (which occurs more so during warm weather).Male alligators are larger than female alligators. The average adult size for a female is 8.2 feet (2.6 meters), and the average size for a male is 11.2 feet (3.4 meters). Exceptionally large males can reach a weight of nearly half a ton or 1,000 pounds (454 kilograms).
What is the difference alligator and crocodile teeth?
Alligators have much broader, U-shaped snouts, while crocodiles have narrower, V-shaped snouts. This difference is due to the different shapes of their teeth. Alligators have teeth that are round and blunt, while crocodiles have teeth that are sharp and pointed.
Since alligators can become large and will feed on almost anything, they pose a mild threat to humans. In Florida, where there is the greatest alligator population, there have been several reported deaths due to alligator attacks in recent years and human-alligator conflicts are common. Dogs and other pets are also sometimes killed.Alligators are hunted mostly for their skin, but also they are hunted for their meat. Today, there is a multi-million dollar industry in which alligators are raised for the production of their meat and skin. Also, alligators are a tourist attraction, especially in Florida, where visitors enjoy nature tours to view and occasionally feed them.American alligators live about 50 years in the wild. After they are 4 feet long, alligators are safe from predators except humans and occasionally other alligators.Once on the verge of extinction, the American alligator has made a remarkable recovery due to strict conservation measures and extensive research. It is no longer endangered except in scattered areas of its range. However, the federal government lists it as threatened because it is very similar in appearance to the American crocodile. Because the American crocodile is endangered, the government does not want hunters to confuse the two different types of animals. Hunting is allowed in some states but it is strictly controlled. The greatest threat is currently destruction of habitat; this includes water management systems and increased levels of mercury and dioxins in the water.
Both males and females have an “armored” body with a muscular, flat tail. The skin on their back is armored with embedded bony plates called osteoderms or scutes. They have four short legs; the front legs have five toes while the back legs have only four toes. Alligators have a long, rounded snout that has upward facing nostrils at the end; this allows breathing to occur while the rest of the body is underwater. The young have bright yellow stripes on the tail; adults have dark stripes on the tail.After mating has taken place, the female builds a nest of vegetation. The nest can measure seven to 10 feet (2.1 to 3 meters) in diameter and two to three feet (0.6 to 0.9 meters) high. Then, around late June and early July, the female lays 35 to 50 eggs. Some females can lay up to 90 eggs. The eggs are then covered with vegetation and hatch after a 65-day incubation period. The sex of the juveniles is determined by the temperature of the nest. Temperatures of 31? C (87.8? F) or below produce females. A temperature of 32? C (89.6? F) produces 75 percent males and 32.5? C (90.5? F) and above are mostly females. Alligator nests are sometimes used by other reptiles for their own egg deposition and incubation.
What are alligators teeth for?
A mature alligator has 80 conical shaped teeth. They have no molars for crushing and grinding food therefore they swallow their food whole. Lost teeth are replaced.
Toward the end of August, the young alligators begin to make high-pitched noises from inside of the egg. This lets the mother know that it is time to remove the nesting material. When the baby alligator hatches it measures about 6 to 8 inches (15 to 20 centimeters). Newly hatched alligators live in small groups, called “pods.” Some 80 percent of young alligators fall victim to predators such as birds, raccoons, bobcats, otters, snakes, large bass and larger alligators. Females aggressively defend their young during these first few years. Crocodilians are one of the only orders of reptiles that offer maternal care to their young. The juveniles grow about a foot a year.
Alligators are carnivorous. They have very strong jaws that can crack a turtle shell. They eat fish, snails and other invertebrates, birds, frogs and mammals that come to the water’s edge. They use their sharp teeth to seize and hold prey. They swallow small prey whole. If the prey is large, they shake it apart into smaller, manageable pieces. If it is very large, they will bite it, then spin on the long axis of their bodies to tear off easily swallowed pieces.
The American alligator is found in the United States from North Carolina to the Rio Grande in Texas. Alligators are usually found in freshwater, slow-moving rivers. They also live in swamps, marshes and lakes. They can only tolerate salt water for brief periods because they do not have salt glands.Female alligators usually remain in a small area. Males can occupy areas greater than two square miles. Both males and females extend their ranges during the breeding season. Young alligators remain in the area where they are hatched and where their mother protects them. After two to three years, they leave that area in search of food or when driven out by larger alligators.
It’s easy to distinguish an alligator from a crocodile by the teeth. The large, fourth tooth in the lower jaw of an alligator fits into a socket in the upper jaw and is not visible when the mouth is closed. This does not happen in crocodiles. Alligators have between 74 and 80 teeth in their mouth at a time. As they wear down, they are replaced. An alligator can go through 3,000 teeth in a lifetime.
Similar in appearance to the endangered American crocodile, alligators are not endangered. They range along waterways in the United States from North Carolina to Texas’s Rio Grande.Both males and females reach sexual maturity when they are about 6 feet (1.8 meters) long, a length attained at about 10 to 12 years. Breeding takes place during the night in shallow waters. Males (bulls) roar to attract females and to ward off other males. The male circles the female and mounts. Courtship starts in April, with mating usually occurring in early May.
One interesting aspect of alligator biology is that even though they do not hibernate, they undergo periods of dormancy when the weather becomes cold. They excavate a depression called a “gator hole” along a waterway to be used when the seasonal temperature falls. In areas where the water level fluctuates, alligators dig themselves into hollows in the mud, which fill with water. These tunnels can be as long as 65 feet (20 m) and provide protection during extreme hot or cold weather. Many other animals also use these burrows after their builder abandons them.
If any animal deserves to be called a terrible lizard, it’s a snake. They have populated our nightmares for so long and taken a central role in our phobic mythologies. Even Harry Potter’s villainous Voldemort has a snake as a pet. There is, as the Beatles might put it, something in the way they move.The evolutionary link between dinosaurs and birds is well established, even within the not-always-scientifically-accurate world of Jurassic Park. A more recent discovery is that one particular dinosaur – the T. rex – shares some fundamental molecular structures with the common chicken.
1. The cassowary’s crest, 2. Cassowary call, 3. Tuatara statistics, 4. Shark diversity, 5. The Cretaceous crab revolution, 6. Evolution of small dinosaurs, 7. Origin of sea turtles, 8. Giant fossilised T. rex excavation, 9. Snake evolution, 10. The Cretaceous-era marine squamate
Those shells are clearly very tough, because immediately after that catastrophe, turtles began to diversify, hugely. There is some debate as to whether turtles count as archosaurs or whether they are more closely related to snakes and lizards. Dr Terri Cleary from the Museum of Birmingham explained the problem: “They probably originate from some sort of reptile that gradually expanded its ribs out and those became its shell. But we don’t have that many informative transitional fossils.”Oh, and if you didn’t already find snakes creepy enough, consider this: because they have such narrow bodies, snakes have arranged their kidneys one in front of the oth-er, rather than side by side. For the same reason, snakes either predominantly favour the right lung over the left, or get by with just the one. Sleep tight! This is what you came for: big, scary reptiles, right? Well, crocodiles share a heritage with dinosaurs as part of a group known as archosaurs (“ruling reptiles”), who date back to the Early Triassic period (250 million years ago). The earliest crocodilian, meanwhile, evolved around 95 million years ago, in the Late Cretaceous period. Modern day crocodiles descended from prehistoric alligators such as Deinosuchus; low to the ground water-dwelling predators with a long snout, a powerful tail and lots and lots of teeth. They’re not dinosaur descendants, they’re not lizards and they did not evolve into birds, but crabs deserve a special mention in this list for developing the kind of personal armoury that, pound for pound, would make an Ankylosaurus think twice.In a way, it’s an insult to sharks to consider them modern day dinosaurs because they’re much older. Their ancestors evolved into recognisably shark-like shapes over 450 million years ago, during the Silurian period. They have survived every major extinction event since the seas were filled with Trilobites. By contrast, dinosaurs are just a flash in the pan.
Turtles are exceptionally successful as a species. They are part of the Testudine group of reptiles, including tortoises and terrapins, found on every continent apart from Antarctica, which have evolved to live on land and in both salt and fresh water. They share common ancestry with dinosaurs – having first appeared around 230 million years ago – and show remarkable resilience considering their fellow creatures are being wiped out. Turtles also survived one mass extinction at the end of the Tri-assic period that left an evolutionary space for dinosaurs to evolve, as well as the one at the end of the Cretaceous era that then wiped out the dinosaurs.
In fact, for all that dinosaur means “terrible lizard”, lizards are only a distant relation to any archosaurs, having split from their common ancestry when they first emerged in the Late Triassic. They – and their snake cousins, under the banner of squamates – went on to adapt and change, resulting in more than 10,000 living species and hun-dreds of now-extinct ones. Depending on circumstance, lizards have had the time to develop a breath-taking arsenal of abilities; swimming, gliding, scaling trees and hanging from ceilings, climbing sheer surfaces, walking on water and losing and re-growing their own tails. This extreme adaptability is almost certainly the key to their survival in the face of several significant extinction events.Here is a similarly remarkable beast, and the sole survivor of a genetic lineage that originated in the early Triassic. Tuataras are members of the reptile group Rhynchocephalia, which blossomed into full diversity between 240 million and 60 million
years ago. They live in the islands off the coast of New Zealand, feeding on beetles, spiders, and snails, as well as small birds that they decapitate with their saw-like teeth. Tuatara can live to be around 100 years old and operate surprisingly well in low temperatures.
They may be commonly referred to as a living dinosaur, but to illustrate just how genetically isolated tuataras have become as a species, let’s look at some statistics.Among the animal grouping “amniote vertibrates”, there are 30,000 modern species divided into six major groups: birds (at least 15,845), lizards and snakes (10,078), mammals (5,416 species), turtles (341), crocodilians (25), and, erm, tuatara (1).
Ever since the first discovery of dinosaur fossils, people have been captivated; wondering what life would be like if prehistoric animals and humans co-existed. Who isn’t gripped by the thrilling concept of a giant lizard predator chasing them down the street? Or merely by being able to wave at a passing Stegosaurus?
Are alligator teeth strong?
Alligators are carnivorous. They have very strong jaws that can crack a turtle shell. They eat fish, snails and other invertebrates, birds, frogs and mammals that come to the water’s edge. They use their sharp teeth to seize and hold prey.
Lobsters and other filter-feeding crustaceans first emerged millions of years before dinosaurs, and in fact the creatures we call horseshoe crabs (more closely related to spiders than modern crabs) appeared around 450 million years ago. But true crabs are a dinosaur-era phenomenon, as they arrived on the scene between 200 and 150 million years ago. They flourished so well in fact, that scientists have ascribed a name to their greatest period of diversity, during which 80% of modern crab groups evolved: “the Cretaceous crab revolution”. Their diversification paved the way for crabs to inhabit a wide variety of environments. This laid the groundwork for them to survive the mass extinction event that wiped out three quarters of the plant and animal species on Earth, including dinosaurs.The snake is another species that evolved to how we know it today by getting rid of key assets – most notably legs, and several bones in the skull that prevented total mobility. The Creta-ceous-era marine squamate Pachyrhachis problematicus (as described by Michael Caldwell and Michael Lee in Nature) can be considered a primitive snake. It has an elapine slender body and mobile skull with extra joints for larger prey, but also a working pelvis and hind limbs.
One of the other characteristics that may link the cassowary to dinosaurs is their casque – the leathery crest on their heads from which their name is derived (“kasu” means horned in Papuan, while “weri” means head). The use of this quiff-like appendage is a topic of some debate. Some scientists believe it can be used to reduce heat, while others suggest it’s used to help the cassowary achieve its booming call, which can hit frequencies that are too low for humans to hear.
That said, humans already share the planet with species that are just as old as dinosaurs and others that are directly descended from them. Some haven’t changed much over the past tens of millions of years, whilst others are practically unrecognisable.
In 2003, Jack Horner and Mary Schweitzer were attempting to extract a giant fossilized T. rex femur from a dig and had to break the bone in half to do so. Inside, they found molecules of the structural protein collagen, which takes different forms in different animals, acting as a kind of protein fingerprint. As there was no other dinosaur collagen to work with, they cross-referenced the Tyrannosaur collagen with modern day animals, including humans, mice and salmon. The closest match was found in chickens and ostriches – two species that have surprisingly little in common, genetically speaking – with alligators coming in third.
So, the next time you find yourself watching Chris Pratt trying to do his Velociraptor-whisperer act in Jurassic World, consider how much more realistic it might be to have him face down three angry emus, or a crocodile with a grudge.
With a lineage this lengthy, the scope for diversity in terms of their make-up and appearance is huge. As with many of the species in this list, there are giants lurking in the shark family tree, such as the Megalodon. And while we may think that hammerhead sharks are odd, their T-shaped heads are nothing compared to the dinner plate sized, spiral-shaped tooth structure of the Helicoprion, or the anvil-shaped dorsal fin of the Stethacanthus. Some species of shark even developed the ability to glow in the dark, which would have made Jaws a very different film, visually speaking.
Interestingly, aside from crocodiles, the only other archosaurs known to have survived into the modern era are birds. This means that crocodiles are closely related to the ducks in your local pond, so be careful the next time you go to feed them (just in case).
While they share a reptilian ancestry that goes back millions of years – and have many common genetic traits, such as the laying of eggs – lizards and dinosaurs went on to follow separate paths of development. This is most evident when you consider their legs. If you imagine any of your favourite dinosaurs, their legs point straight to the ground, like those of horses or humans. By contrast, lizards and crocodiles have legs that sprawl out to the side.
Judging by its giant, claw-like feet alone, it’s easy to see why people think this giant bird is directly descended from dinosaurs such as velociraptors. They are the third largest bird species in the world and have been known to attack humans. These creatures can be found in northern Australia, Papua New Guinea and Indonesia, and have signature blue necks. Some fun facts for you: they produce green eggs and are also really good swimmers.
Ostriches, cassowaries, kiwis and emus belong to a group of large flightless birds called ratites. Their link with the dinosaurs? Ornithologist Peter Houde, of the Smith-sonian Institution, put forward the theory that small dinosaurs evolved into small birds, some of which flew to environments where their success as a species depended on staying on the ground. He felt that ratites had evolved “backwards” into a loss of flight, otherwise there could be no explanation for their sudden appearance in vari-ous island landmasses. The reverse evolution might also explain the shaggy feathers and “reptile jaw” of the ostrich, which may have grown to its current size in order to fight off larger predators.
Though the understanding necessary to make regenerative medicine a possibility in humans is still far off, Chuong says that one day scientists will be able to inject hormones or molecules that will cause humans to grow new teeth.
“When the mature tooth falls out, the second one becomes a mature one, and the stem cell becomes a baby one. Interestingly, they are able to do this process repeatedly,” he says. “In humans, we have a similar structure when we’re born, but we don’t have any stem cell there under normal conditions.” “I like to think we are learning the grammar of a new language. Once we learn more rules, we will be able to write an essay or a poem or a book,” he says. An alligator can regenerate a lost tooth up to 50 times. In what must come as good news for hockey players, researchers at the University of Southern California are studying alligators’ teeth to see if doctors could one day stimulate adult humans to automatically replace a tooth if they lose one.
Chuong says that the DNA of humans contains the genetic material necessary to grown teeth and even regenerate other parts of the body, but that code isn’t “turned on.” “Primitive animals have more robust regenerative power. Humans have more specialized cells, and the price we pay for that specialization is that we have fewer stem cells around,” he says. “The percentage of stem cells in lower animals is much higher than it is in humans.” Regeneration is relatively common in the animal kingdom—certain types of salamanders can regenerate limbs, lobsters and stone crabs can grow new claws, starfish can grown new appendages and many types of predators, including sharks and alligators, can regenerate teeth.According to lead author Cheng Ming Chuong, alligator’s teeth are very similar to humans, and his team may have discovered why they have regenerative properties.
Chuong says that alligators’ teeth grow in sets of three: They have an adult tooth in their mouth, a replacement or “baby” tooth in waiting in case of a lost tooth, and then a stem cell that can become a replacement tooth if necessary.From the Titan submersible to Virgin Galactic’s rocket plane, the ultra rich are paying top dollar for extreme adventures that can be short on regulations and high on danger. “In a way, our hair can keep regenerating multiple times in our life. But human teeth only have one chance—when we change from [baby] teeth to permanent teeth,” he says. “The motivation for studying this is so that we’ll one day be able to do this.” It’s true that the carinae on crocodile teeth kind of disappear amongst the striations, as in the case of the tooth above. But they’re still there, though.
Though I admittedly have but a few gator teeth in my collection, I think a much better way of differentiating is on shape and tooth ornamentation. Crocodile teeth (excluding those of shell-crushing crocodiles) are more slender, taper into a point, and often bear striations running the length of the crown in parallel (as opposed to interdigitating), from root to tip. Gator teeth, on the other hand, are more robust, in the sense that they’re stubbier, have a more overall rounded appearance, and may have rugose ornamentation.
Thank you, your analysis is always much obliged. I may well wait; 25 mm is a little smaller than I’d like, or simply search for one on sale from the Potomac because those look a good bit more sizeable.The easiest way to identify them is to look at the tip of the tooth, and trace them down the sides of the crown – although they might not reach all the way down to the root. The carinae will be thicker than regular striations, however, and/or may mark a difference in the tooth’s degree of cross-sectional curvature (i.e., the shape in the horizontal plane, or “bulginess” of the tooth).
I also tend to think that gator teeth are short and fat compared to smaller long and skinny croc teeth. Finally, Croc has longitudinal lines. 2nd from the left is what I think of as a proto_typical Croc tooth.I have here a 25mm long tooth from Bone Valley, Polk County, Florida. It is from the Miocene. The seller advertises this as a crocodile tooth. To me, it looks alligator. I could be wrong; how might one differentiate?Crocodile teeth (excluding those of shell-crushing crocodiles) are more slender, taper into a point, and often bear striations running the length of the crown in parallel (as opposed to interdigitating), from root to tip. Gator teeth, on the other hand, are more robust, in the sense that they’re stubbier, have a more overall rounded appearance, and may have rugose ornamentation.The species are believed to be the youngest representatives, geologically speaking, of metriorhynchid crocodiles. They disappeared during the Cretaceous period, long before the extinction of the dinosaurs. Researchers spotted the specimens in June 2020 and gained permission to borrow them for a close examination, including chemical analysis and examination under a high-powered microscope. The animals inhabited shallow marine ecosystems in North and South America and the chain of Meditteranean islands that would later become the European continent. Scientists estimate they would have been around 23 feet long.
By mid-August the team representing the Institute of Paleobiology at the Polish Academy of Sciences and the School of GeoSciences at the University of Edinburgh in Scotland finished their work, with help from the Viennese museum’s experts. Their findings were published on May 20, 2021.The teeth were found in a quarry near the Czech town of Stramberk in 1912. Since then, they have been kept at the Natural History Museum in Vienna — but without any detailed information about what species they came from or when it lived.
Are crocodile teeth poisonous?
Alligator and crocodile bites usually result from handling; however, rarely, native encounters occur. Bites are not venomous, are notable for a high frequency of soft-tissue infections by Aeromonas species (usually Aeromonas hydrophila), and are generally treated as major trauma.
The team that made the discovery came from multiple European universities and museums, including the Natural History Museum in Bielefeld, the Polish Academy of Sciences, the Institute for Geological Engineering in the Czech Republic and the School of GeoSciences at the University of Edinburgh.
The study was published in the open-access scientific journal Acta Palaeontologica Polonica, published by the Institute of Paleobiology of the Polish Academy of Sciences.
Do crocodiles have dinosaur DNA?
Well, crocodiles share a heritage with dinosaurs as part of a group known as archosaurs (“ruling reptiles”), who date back to the Early Triassic period (250 million years ago). The earliest crocodilian, meanwhile, evolved around 95 million years ago, in the Late Cretaceous period.
The teeth come from members of the extinct marine crocodile family Metriorhynchidae, which dates back around 138 million years to the Early Cretaceous period.Experts from multiple European institutions have proven that fossilized teeth dating back 138 million years are from a previously unknown species of extinct sea crocodiles.
The findings show the power of historic collections for modern discoveries, the authors write. Scientists, they concluded, can reveal “new secrets” from collections, even after decades of modern methodology and insight from specialists.
What animal can regrow teeth?
alligator An alligator can regenerate a lost tooth up to 50 times. In what must come as good news for hockey players, researchers at the University of Southern California are studying alligators’ teeth to see if doctors could one day stimulate adult humans to automatically replace a tooth if they lose one.
Metriorhynchid crocodiles belong to the archosaur group, which also includes dinosaurs, pterosaurs, birds and sea crocodiles, which were the best adapted to marine waters.