Similarities and differences between humans and animals; an ancient mud city; the size and capacity of ape and human brains.
David Attenborough looks at an amazing variety of monkeys from all over the world, including red howler monkeys in Venezuela, capuchin monkeys in the Costa Rican swamps, and guenon monkeys in West Africa.
A look at tree dwellers - mammals which have adapted to a life at height.
Mammals that have returned to the sea during the evolutionary process; the blue whale; dolphins.
Omnivores' resourcefulness enables them to take advantage of gluts of some kinds of foods and helps them survive.
Carnivores may hunt alone or in packs.
Agoutis and squirrels have sharp front teeth for opening nuts; kangaroo rats store seeds in elaborate nests and burrows.
Examining herbivores and how they make the most of their plant fodder.
Early mammals consumed insects.
Mammals regulate their temperatures and nurture their young on milk.