This is an artistic exhibition of an ancient marine reptile named plesiosaur. Plesiosaurs lived in Antarctica. Researchers described plesiosaur in the latest issue of the Journal of Vertebrate Zoology. They have long necks and four fins. However, the plesiosaur mentioned in the research report is different from the plesiosaur shown in this picture. Paleontologists recently found shark teeth on plesiosaur fossils, indicating that plesiosaur may be besieged by sharks.

2. Ancient seabirds

Pelagornithid, an ancient seabird, was huge, almost equivalent to a small plane. Fifty million years ago, they lived in today's Britain.

3. Camarasaurus

This is the extinct sauropod dinosaur Camarasaurus. About 1 100 million years ago, Camarasaurus lived in today's Sahara desert.

4. Mammoth

Mammoths are bigger than mastodons, and their teeth are curved rather than straight. They disappeared from the earth at the end of the ice age about 65438+ 10 million years ago. Scientists have not yet determined whether climate change or human hunting activities are the main culprit leading to the extinction of mammoths. Others believe that the impact of a comet on the earth made mammoths disappear from the earth.

5. Megaeye Whale

Scientists speculate that this ancient whale is a fierce "hunter" and disappeared from the earth 25 million years ago. Although they may be the ancestors of modern baleen whales, unlike docile baleen whales, this whale has two rows of sharp teeth and huge eyes, which is conducive to hunting.

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