Main content
The Elephant
1/5How did the elephant get so big? We reveal how a tiny cell became a giant.
The Ostrich
2/5Why are ostrich eggs the world’s largest? Chris Packham tells the story of reproduction.
The Bat
3/5Why is the bat so hungry? Chris Packham reveals how feeding has shaped animal life.
The Dolphin
4/5How did the dolphin get so smart? Chris Packham explores the origins of intelligence.
The Horse
5/5Why do horses run so fast? Chris Packham traces the origins of animal movement.
