New filming techniques reveal behaviour that was previously impossible to capture in extreme locations. Fly amongst one of the largest migrations on Earth, as more than ten million fruit bats leave the Congo basin and converge in a few special trees in Zambia to feed; sprint with the tiny, extraordinary-looking sengis as it escapes a predatory lizard; see 30 polar bears gather to feed on a bowhead whale carcass; and witness the biggest fight on Earthàmale humpback whales battling for a female.

Originally released by BBC Worldwide Learning, 2009. Streaming video file encoded with permission for digital streaming by Infobase on April 20, 2018.

Weddell Seals (4:52); --Insect Eating Mammals (5:04); -- Reindeer (5:24); -- Fruit Bats (5:32); -- Safety in Numbers (4:30); -- Polar Bears (4:01); -- Groups of Mammals (6:14); -- Elephants (5:34); -- Humpback Whales (6:43); -- Credits: Mammals (0:39); .