1/5 Revealing how animals first left the seas to colonise the land over 400 million years ago.
1/3 The cubs are born and struggle through their first dramatic weeks.
10/10 David Attenborough looks at birds living in harsh environments.
9/10 David Attenborough looks at the ways in which birds solve the problems of parenthood.
8/10 David Attenborough examines how birds look after their eggs.
7/10 A look at mating rituals.
6/10 A look at the methods of communication that birds use.
17/20 Lord Bath dishes the dirt on his great-great-great-great-grandfather.
5/10 In this programme, a focus on the remarkable variety of aquatic birds.
4/10 David focuses on birds of prey, from meat-eating parrots to eagles that catch monkeys.