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Iolo Williams showcases animals that use intelligence to survive the challenges of winter.

He begins on Anglesey, where he joins raven expert
Nigel Brown to investigate these highly intelligent birds, using thermal imagery to uncover the secrets of their night-time activities. Ravens are highly social and raucous as they gather to roost and share information about where food can be found – vital when resources are scarce.

While ravens are masterminds of the air, beneath the waves, a curled octopus is on the hunt - but will this cunning creature be outwitted by a crafty cuttlefish?

In our rivers, some kingfishers have learnt to get a meal by following otters, diving to catch any small fish that are disturbed as an otter swim by. Although watching wildlife may not make us any cleverer, it can certainly lift our spirits, especially this potentially gloomy time of year. Author and artist Emma Mitchell shares five tips to get the most out of a mood-boosting winter walk, and Iolo introduces a soothing mindfulness moment with the sights and sounds of a Welsh river.