Common ancestor of fish, land animals found. Scientists have discovered a 405-million-year-old fossilized fish that shares characteristics of modern bony fishes and land vertebrates.

Most people can only hold their breath for a minute or two, but some land animals have incredible lung capacity. Whether for hunting, hiding, or survival, these creatures can stay underwater far ...

The story of two of the strangest animals on the planet just got a little stranger, thanks to clues revealed by a lone fossil specimen that scientists now say represents a long-extinct ancestor.

Diplodocus, the most common sauropod exhibited in museums, inspires awe for its size. ... and air-filled bodies explain why sauropods are bigger than other land animals in general.

A new study suggests the platypus and echidna — the only egg-laying mammals — had a water-dwelling ancestor. The finding could upend what’s known of their evolution.

By Amanda Schupak, CNN (CNN) — The story of two of the strangest animals on the planet just got a little stranger, thanks to clues revealed by a lone fossil specimen that scientists now say ...

A new study suggests the platypus and echidna — the only egg-laying mammals — had a water-dwelling ancestor. The finding could upend what’s known of their evolution.