Learn how new research challenges long-held assumptions about animal evolution and suggests that the earliest animals may ...

After using a technique called molecular clock analysis, researchers have proposed that the origin of animals could be 200 ...

Movement defines life across the animal kingdom. From a fish cutting through water to a bird taking flight, muscles power every action. For decades, scientists believed the machinery behind those ...

Paleontologists suggested that zhelestids represented an unknown group of hoofed mammals—now known to be rather far from the ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. The evolution of some of the earliest complex animals on our planet may ...

Scientists typically predict how species evolve by looking at their genes and the environment they live in, but new research from the University of Aberdeen has highlighted a key factor that's often ...

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.

A microorganism whose evolutionary roots can be traced to the era of the first multicellular animals may provide a glimpse of how single-celled organisms made a critical evolutionary leap. In ...

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Missing animals in exceptionally preserved rocks expose uncertainty in the fossil constraints used to date the animal kingdom.