Animals that researchers call “supersucklers” come back to nurse even after they can hunt, mate and fend for themselves.

The nest parasites get a bad rap for making other birds raise their young, but study by study, Mark Hauber and his “Cowbird ...

Many animals do something that still surprises researchers: females often mate with more than one male. This ...

Same-sex sexual behaviour has been recorded in around 1,500 species, from insects and starfish to birds and mammals. Yet sex ...

Biologists tend to look at the animal kingdom and try to categorize things in an organized fashion. But nature has a way of ...