When the environment changes dramatically, animals from mollusks to crows can make big changes in their behavior that enable them to survive. For example, marmots and ground squirrels in California ...

Fossils from some of the oldest-known animals on Earth, dating from 574 million years ago (Ediacaran period), suggest that cloning, not competition, dominated the Ediacaran seas, slowing evolution ...

The alternative text for this image may have been generated using AI. In this Review, we summarize recent findings from studies of diverse eukaryotes, especially early-branching animals and close ...

A study has found that the reason why the evolution of the first animals to appear on Earth was delayed for over 10 million ...

In most narratives, the story of evolution is the story of organisms emerging from the ocean and eventually populating the land. But for some species that evolution also involved a return trip. Dozens ...

Rodents are arguably the most used animal models in biological research. However, scientists can employ alternative animal models, which often possess unique traits or adaptations, to improve their ...