Mammals dominate the planet. They do it through having warm blood and by the care they lavish on their young. Filming in the bitter Antarctic winter reveal how a mother Weddell seal wears her teeth down keeping open a hole in the ice so she can catch fish for her pup. A powered hot air balloon captures stunning images of millions of migrating bats as they converge on fruiting trees in Zambia.
Stars: David Attenborough, Simon Blakeney, Nick Guy
Writer(s): Paul Spillenger