Cold-adapted animals started to evolve 2.6 million years ago when the permanent ice at the poles became more prevalent. There followed a time when the continental ice sheets expanded and contracted ...

A new fossil and DNA analysis traces how dozens of sloth species responded to climate shifts and humans. Just two small tree-dwelling sloths remain today.

An analysis of the sloth family tree suggests three different groups of the animals evolved to gigantic sizes in response to ...

These human ancestors would have had plenty to take advantage of near these ancient rivers. Trees bore fruit all year, and ...

The study adds to evidence challenging the dominance of ‘natural selection’ as the sole adaptive force in evolution.

A recent study published in Nature Astronomyhas provided compelling evidence for a frozen ocean world on the dwarf planet ...

Now researchers are learning that they have also evolved another remarkable genetic adaptation since their ancestors first ...