Mammals dominate the planet. They do it through having warm blood and by the care they lavish on their young.
Weeks of 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 produced stunning images of millions of migrating bats as they converge on fruiting trees in Zambia.
Slow-motion cameras reveal how a mother rufous sengi exhausts a chasing lizard.
A gyroscopically stabilised camera moves alongside migrating caribou, and a diving team swim among the planet's biggest fight as male humpback whales battle for a female.