There hasn’t been a lot of research into adult cat play, but a new study shows it’s not just dogs who like to play fetch.

My team studied bluefin tuna otoliths to learn why some populations are recovering faster than others.

Charles Darwin knew the evidence from fossils contradicted evolution. Researchers are still trying to work out the problem today.

Animals often give birth to litters of more than one offspring at a time. But are those babies twins?

A few marine mammals in apparent revolt pushed meme-makers into overdrive. But a scholar who thinks about justice and human-animal relations suggests something deeper is behind the schadenfreude.