1/2 A wolf pack returns to the snowy peaks of Washington's Cascade Mountains.
3/3 The team see first-hand the impact that humans have had on the Galapagos Islands.
3/3 In Scotland, Adam Henson climbs the fearsome, secret side of Ben Nevis.
6/6 It's the end of an extraordinary year for the animals of the Serengeti.
3/3 Hugh and Anita's attempt to solve our plastic problems draws to a dramatic conclusion.
An international team of scientists is trying to change perceptions of sharks.
8/11 David Attenborough's natural history series looks at tropical rainforests.
7/7 David Attenborough investigates the effects of rising temperatures in the polar regions.
4/8 A look at the survival techniques of creatures in the Arctic and Antarctic.
7/10 David Attenborough explores the issues behind the series' most spectacular stories.