According to recent scientific research, more than 450 different kinds of animals engage in homosexual activity.
Like us, animals are exposed to parasites, bacteria and viruses - the germs which cause disease. How do they survive these attacks?
An Indonesian legend claims that monkeys can speak but they prefer to stay quiet. Do animals have languages that we don't understand?
Man is not the only social animal. At the beginning of 2001, Franz de Waal published his work on a group of chimpanzees in the Arnhem zoo, in the Netherlands.
Altruism, an act that bestows a benefit on the recipient while conferring a cost to the actor, is one of the central paradoxes of evolution.
Recent discoveries have shown that hundreds of animal species use tools.