From skateboarding dogs to chimp maths geniuses, Liz Bonnin searches for the planet's most intelligent animals, and John Humphrys puts a goldfish through its paces on Mastermind. Show more

This week Nick Knowles's DIY SOS team pitch up in Avening in the Cotswolds to help project manager Ben, whose life was changed in a split second by a freak accident. Show more

Michaela Strachan and Iolo Williams test a golden eagle against a white-tailed eagle in a Lord of the Wings spectacular. Gillian Burke sees how disused mines have been reclaimed. Show more

Chris Packham and Michaela Strachan are live from Scotland. Gillian Burke is on the trail of a surprising winter insect spectacle, and Iolo Williams hopes to track down a wildcat. Show more

Liz Bonnin embarks on a worldwide search for the planet's most intelligent animals. Featuring grey whales with emotions much like our own and eye-poking capuchin armies. Show more

From freshwater jungle ponds to the dark depths of the open ocean, air breathing mammals have found remarkable ways to overcome the many challenges of a life in water. Show more