Chris Packham, Michaela Strachan and Martin Hughes-Games host from Sherborne, where after a disappointing spring and autumn for badger activity, things are starting to look up this winter. They've also been catching fascinating infra-red images, complete with haunting sounds, from the UK's smallest deer species, the Muntjac.

Martin continues to delve deeper into the Sherborne landscape, getting his feet wet again in the Sherborne Brook where he looks for evidence of spawning trout.

Gillian Burke is on Islay, off the west coast of Scotland, tracking down a family of otters who live around one of the island's famous whisky distilleries. It's a rugged place, and Gillian explains some of the tricks of the trade that these mammals use to get through the bitter winters.

Chris Packham and Michaela Strachan host. Martin Hughes-Games has updates on what has been going on in the bat roost since we left it in Autumnwatch.

Michaela Strachan, Chris Packham and Martin Hughes-Games wrap up the series with live action and reports from our cameras. Gillian Burke also has her last report from Islay.