Gillian reports on the return of giant blue-finned tuna to Cornwall, gannets take a leap of faith in Yorkshire, and Iolo joins leaping salmon in Wales.

Chris Packham, Michaela Strachan, Gillian Burke and Iolo Williams broadcast live from the Dell of Abernathy in the Cairngorms. Tim Peake explains how autumn was born four and a half billion years ago.

Chris Packham, Michaela Strachan, Gillian Burke and Iolo Williams are live from the Cairngorms National Park. Michaela embarks on a wild goose chase and the camera team attempt to find a deer rut.

It is Halloween so time to reveal the wild secrets of Troll Mountain on the Island of Rum. Chris reveals the surprising science inside an antler and the team go hunting for Britain’s biggest spider.

The team end their week-long adventure in the Cairngorms looking at the autumns of the future and discovering encouraging news about Scottish wildcats.

Chris is in the New Forest watching autumn transform his home, and Iolo is at the spectacular Centre of Alternative Technology in west Wales.

Chris Packham, Michaela Strachan, Gillian Burke and Iolo Williams are live from the New Forest, Fife, Yorkshire and Powys. There is more drama from Michaela’s Scottish seal colony.

Chris catches up with a mob of hungry teenage white-tailed eagles, released on the Isle of Wight.

Autumnwatch is inspired by Halloween. Gillian shows off the amazing hydraulic power of spiders’ legs. Iolo has an exclusive update on the remarkable story of a giant vulture.

Gillian reveals the surprising wildlife to be found amongst the chimney stacks and industrial ponds of South Yorkshire.