Why monitor lizards and crocodiles are dinosaurs

The mystery of dinosaur extinction.

Dinosaurs used to be the most successful creatures on the earth, from 200 million years ago to 65 million years, ruling the earth for 150 million years, however, at the end of the Mesozoic Era, it quickly became extinct, scientists have different opinions, put forward climate change theory, asteroid collision theory, nova ** theory, survival of the fittest theory and so on to explain the reason for its extinction, but some people believe that dinosaurs did not go extinct, but evolved into birds, modern birds, from hummingbirds to ostriches, are all descendants of dinosaurs. On the island of Komodo in Indonesia, there is a head like a snake, a body like a lizard, short limbs, and a huge animal called Komodo dragon, which is believed to be the descendant of prehistoric dinosaurs. It seems that humanity needs to learn more about dinosaurs and the mystery of their extinction.

Not only these two, but also sea turtles.

Monitor lizards and crocodiles are not dinosaurs, they are close relatives, mammals are distant relatives, some lizards have not changed much in hundreds of millions of years, and the ancestors of ancient mammals and dinosaurs all look similar to the current lizards, so they will think that they are a kind of animal.

All vertebrates on land evolved as a fish that crawled ashore, and there is a fish that evolves into a salamander-like amphibian (lizard-like appearance) and then branches out, and one of these amphibians has a dominant species that evolves into a reptile (also resembling a lizard) that reproduces completely out of water, which we call amniotes, and this reptile evolves in three branches. One is the non-porous class, the ancestor of the turtle. One is the two-hole class, lizards, crocodiles, dinosaurs belong to this category, lizards have evolved snakes, and dinosaurs have evolved birds.

One is the inferior pore, which is the ancestor of mammals. In more than 300 million years, the biorres and the lower pore took turns to compete for the dominance of the earth, the Permian Triassic is the ancestor of mammals, the quasi-mammals are dominant, there are many species, the Triassic century mass extinction of the lower pore class is almost extinct, only the orbiculus is left, the dinosaurs of the lower pore class rose to rule the Jurassic and Cretaceous, and the mammals only remain very weak and insectivorous like mice. Most of the mass extinction dinosaurs in the late Cretaceous century were extinct, and the remnants of mammals evolved into a wide variety of species to regain dominance.

The difference between dinosaurs and crocodiles is divided into five aspects: action, hair, reproduction, body temperature, and predation, which are as follows:

1. Behavior:

Dinosaurs had limbs located under their abdomen, perpendicular to their abdomen, and walked on four or two legs, even running at a speed of seventy or eighty kilometers per hour. Reptiles such as crocodiles, with their limbs located on their sides, can only crawl (with the exception of a few lizards), with a maximum of 10 kilometers per hour.

2. The hair side is not old:

There were many dinosaurs, especially theropods, that mostly had hair, even fluff or feathers, on their bodies that could glide.

3. Reproduction:

Crocodiles do not have egg-incubating behavior, while some theropod dinosaurs, such as ovivoiraptorosaurs, have egg-incubating habits.

4. Body temperature:

Ovirapiraptorosaurs, and even some long-haired dinosaurs, were homeotherms, while crocodile lizards, etc., were ectotherms.

5. Predation:

The vast majority of dinosaurs were able to capture or tear their prey with their forelimbs, while crocodiles' forelimbs were only used for crawling, not for predation.

1. Crocodiles and dinosaurs are animals of the same era;

2. The crocodile is the earliest and most primitive reptile found alive so far, it evolved from amphibians in the Mesozoic era from the Triassic to the Cretaceous, and it is still a semi-aquatic ferocious reptile to this day;

3. Dinosaurs first appeared in the Triassic of Yekaichan 230 million years ago, and perished at the end of the Cretaceous period that occurred in the late Baisunyan Cretaceous period about 65 million years ago. The extinction of the dinosaurs, whether it is the impact of the environment or its own reasons, is already fossils; The presence of the crocodile is a testament to the power of its life.

Hello, I'm glad to solve the problem for you, I have seen your problem and am sorting out the answer, please wait a moment.

Hello, I'm glad to solve the problem for you, I have seen your problem and am sorting out the answer, please wait a moment.

Hello dear! Glad to solve the problem for you 1.Crocodile progenitor and crocodile is a dinosaur that evolved slowly 2.Crocodile is not the ancestor of crocodiles. It was only because of its crocodile-like mouth that this dinosaur was named crocodile-like.

It is actually a large theropod dinosaur of the Spinosauridae family, which lived in the early Cretaceous period.

Summary. Hello dear <>

Crocodiles are not descendants of dinosaurs. There are many similarities between crocodiles and dinosaurs, just from the appearance of crocodiles and dinosaurs are very similar, in addition to the appearance, the two also have some common characteristics, such as they both rely on the temperature of the environment to change the body temperature, the appearance of the armor-like shell, sharp teeth and flexible claws.

Are crocodiles descendants of dinosaurs.

Hello dear <>

The crocodile is not a descendant of dinosaurs. There are many similarities between crocodiles and dinosaurs, just from the appearance of crocodiles and dinosaurs are very similar, in addition to appearance, the two also have some of the same characteristics, such as they both rely on the temperature of the environment to change the body temperature, the appearance of the armor-like shell, sharp teeth and flexible claws only pei.

In fact, crocodiles existed longer than dinosaurs. The second generation of the Phanerozoic - the Mesozoic. The time period is later than the Paleozoic but earlier than the Cenozoic, and the strata formed in the middle of the two periods are called the Mesozoic.

About 200 million years before the Mesozoic Era, crocodiles have been in continuous evolution, and from the perspective of time periods, crocodiles have been a group of members of the Ming and Rotten Books on the earth, so its qualifications for survival on the earth are many years older than that of dinosaurs.