(Reuters) - Scientists in Australia have unearthed beautifully preserved fossilized hearts and other internal organs of ancient armored fish in a discovery that provides insight into the evolution of ...

Earth’s vertebrate diversity may be far richer than anyone realized. A sweeping analysis of more than 300 studies suggests that for every known fish, bird, reptile, amphibian, or mammal species, there ...

With over 30,000 different species of fish, the ocean is filled with a colorful display of incredible sea creatures. Fish are ...

(CNN) — Hundreds of millions of years ago, jawless fishes swam Earth’s seas, their brains protected on the outside by armored skin, and on the inside by plates made of cartilage. Scientists are still ...

A mass extinction of fish 360 million years ago hit the reset button on Earth’s life, setting the stage for modern vertebrate biodiversity. The mass extinction scrambled the species pool near the time ...

A new study led by researchers at the University of Arizona suggests that for every recognized vertebrate species, there are, on average, two ...