Researchers discovered that a 215-million-year-old reptile started life on four legs and switched to two as an adult.

DNA is revealing that many animals once thought to be a single species may actually be several hidden ones. But research on ...

Scientists discover webbed feet in land animals, challenging common assumptions. This trait, initially for swimming, also ...

Scientists discovered some of the oldest bony fish fossils in China. The fossils explain the early history of animals with backbones.

So, you've spotted some unfamiliar eggs in your garden. What next? Here are some tips for identifying common animal eggs and ...

That visibility comes with scrutiny. Mammals are among the best-studied organisms on Earth - and among the most threatened.

Roughly 6,800 mammal species are known to exist, compared with about 8,800 species of amphibian, 11,000 species of bird and 12,500 of reptile. Yet when most people picture biodiversity, they often ...

We discuss the 10 most venomous animals on Earth. Read all about them, from the rockfish to the most venomous of all, the Inland Taipan Snake.

One such molecule is known as bradykinin. It is shared by all vertebrates, including mammals, reptiles, birds and fish. But it is also present in the venoms of some wasps and the toxic skin secretions ...