Have you ever wondered why moose in Alaska are larger than their southern relatives? Have you considered why many Arctic mammals appear bulkier than species living closer to the equator? There’s a ...

Add Yahoo as a preferred source to see more of our stories on Google. Once upon a time, there were a bunch of one-celled microbes, swimming, eating, reproducing, doing all the things that a one-cell ...

New research shows that the earliest sponges were soft bodied and lacked skeletons, explaining why their oldest fossils are ...

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

From whale songs to lion roars, animals have evolved to stretch their voices across distances so that friends—and sometimes foes—can hear them. Each sound is coded with messages like "Come here!" ...

A nearly complete dinosaur skeleton discovered in Patagonia is helping scientists crack the mystery of alvarezsaurs, a bizarre group of bird-like dinosaurs. The fossil of Alnashetri cerropoliciensis ...

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

The next step is to build a sleeker model that’s easier to manipulate, scientist say.

The relationship between changes in the environment and evolution in wild animals is not a one-way street, according to a new study that includes a Penn State biologist. The study shows that ...

In five cases where vertebrates evolved monogamy, the same changes in gene expression occurred each time. In many non-monogamous species, females provide all or most of the offspring care. In ...

To understand the origins of multicelled life, researchers are studying a motley assortment of simpler animal relatives. The commonalities they’re unearthing offer a trove of clues about our mutual ...