450-million-year-old sea creatures had a leg up on breathing

A new study has found the first evidence of sophisticated breathing organs in 450-million-year-old sea creatures. Contrary to previous thought, trilobites were leg breathers, with structures resembling gills hanging off their ...

Fossil tells the 'tail' of an ancient beast

Approximately 200 million years ago, Antarctica was attached to South America, Africa, India, and Australia in a single "supercontinent" called Gondwana. Paleontologists have long wondered about the unique mammals that lived ...

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