At first glance, this mammal looks like a horse gone terribly wrong. But, in reality, Chalicotherium is far from a botched ...

(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 represents a long-extinct ...

Evolution is a continuous, powerful force shaping the natural world around us. As environmental pressures intensify, future animal evolution is likely to produce fascinating and sometimes bizarre new ...

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 ...

The evolution of some of the earliest complex animals on our planet may have been spurred on by other, simpler early animals. These simple marine animals first evolved around 560 million years ago and ...

A series of whole genome and gene duplication events that go back hundreds of millions of years have laid the foundations for tissue-specific gene expression, according to a new study. The 'copy-paste ...

The new theoretical research proposes that animal size over time depends on two key ecological factors. The mystery behind why Alaskan horses, cryptodiran turtles and island lizards shrunk over time ...

Evolution is often perceived as an incredibly slow, natural process driven by environmental pressures over millennia. That characterization certainly holds true, but humans have also repeatedly ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The story of two of ...