Some animals can regrow lost body parts. Salamanders and frog tadpoles can rebuild entire limbs after amputation. Mammals cannot. For decades, biologists have tried to understand why. Now a team led ...

The mummified remains of of a land-dwelling vertebrate are helping to reveal how early ancient reptiles began to take a breath with their whole chests — the breathing style used by modern reptiles, ...

It has been a persistent mystery. Why is it that some amphibians, such as salamanders and frog tadpoles, can regenerate lost limbs while mammals can’t? For decades, scientists have tried to understand ...