If you've ever seen a dolphin swim, you may have wondered why they undulate their bodies up and down when swimming, instead of side to side as fishes do. Though they have a fishlike body, cetaceans (a ...

Vertebrates are animals with a backbone. You are a vertebrate. And now, a researcher has formally described the world’s tiniest vertebrate — a new species of frog.

A study of fossilized lampreys dating from more than 300 million years ago is challenging a long-held theory about the evolutionary origin of vertebrates. These ancient, jawless, eel-like fishes arose ...

The oldest chambered hearts have been discovered in fossils from Western Australia. The two-chambered organs, which date back about 380 million years, are preserved within remarkable three-dimensional ...

Common dolphin off the coast of Australia. This species lives in the open ocean, can reach high swimming speeds, has more than 70 vertebrate and up to eight regions in their backbone. If you’ve ever ...

Ottawa, March 10, 2021 - A new study of fossilized lampreys dating from more than 300 million years ago is challenging a long-held theory about the evolutionary origin of vertebrates (all animals with ...