Have you ever wondered why orangutans have those flappy cheeks, or why mandrills have such colourful faces, or why vultures are bald, or even why hammerheads have, well, hammer-shaped heads? This episode explains it all. It shows unique animals that managed to survive by evolving from the neck up.

pt. 1. Vultures: A Nose and A Head to Survive -- pt. 2. Hammerhead Sharks: A Head for Survival -- pt. 3. Orangutans: Cheeky Primates! -- pt. 4. Why Do Giraffes Have Long Necks? -- pt. 5. Mandrills: A Face of Colour.