Animal

Human testicles are much smaller, in proportion, to some of our primate cousins. Evolution can tell us why. But the size of other body parts is a little bit more of a mystery.

Some cats are quiet, while others meow loudly for attention. What makes the difference may be buried deep in their genes.

Long before T. rex, the Earth was dominated by super-carnivores stranger and more terrifying than anything dreamed up by Hollywood.

Fifty years since the release of Jaws, these photographers are showing a different, less frightening view of great white sharks.

A new programme using a form of horse therapy is attempting to tackle the trauma that is thought to lie behind the high rates of arrest and imprisonment among US veterans.

Living with animals is thought to have profound effects on our immunity – potentially reducing the risk of allergies, eczema and even autoimmune conditions.

Reports of human-snake encounters are on the rise – and some people react to a snake on their property by killing it. But is there a better way, for both people and the reptiles?

As Romania's bear population grows, so do the opportunities for travellers to come face to face with the predators in a responsible way.