Chimpanzees from the Savanna use human-like tools to dig up roots and potatoes. This is one of the behaviours that people used to believe was uniquely human.
The sperm of songbirds swim ten times faster than human sperm. Sperm cells are the most variable cells in the whole animal kingdom when it comes to size.
Chris Smith
Chris Smith is a clinical lecturer in virology at Cambridge University and the founder and managing editor of the Naked Scientists.