When sick, Nile tilapia seek warmer water. That behavioral fever triggers a specialized immune response, hinting the connection evolved long ago.

To take the investigation even further, the team examined what our common ancient ancestor — perhaps of animals and choanoflagellates — looked like. Colleagues at the Max Planck Institute for ...

Even when there are fewer than five digits in the adult animal -- as in horses' hooves ... All tetrapods descended from a common ancestor that just happened to have limbs with five digits.

All modern dogs are descendants of wolves, though this domestication may have happened twice, producing groups of dogs descended from two unique common ancestors. How and when this domestication ...

Quantifying which individuals share genetic material from common ancestors plays a central role in several scientific disciplines, particularly animal behavior, conservation biology, and genetic ...

That individual animal lived not so long before ... which were very common in the Hell Creek fauna. The first alligator ancestors evolved some 245 million years ago. About 80 million years ago ...