About this programme

3/10. David Attenborough reveals how mammals dominate the planet and survive in extreme habitats. In the Antarctic, a lone Weddell seal wears its teeth down keeping an ice hole open to catch fish for its pup. In warmer climes, the gerbil-like rufous sengi demonstrates impressive speed to avoid reptilian predators, giant bats feast on fruit trees in Zambia and male humpback whales battle for a female.