Adaptation

18th February 2025 29 mins Season 21 Episode 2

Iolo Williams explores the various strategies that animals use to survive harsh winters, including the incredible adaptations that mean ducks' feet don’t freeze and pond creatures can survive under ice. Iolo also visits a greater horseshoe bat roost before they move on to hibernate and searches for the caterpillars of marsh fritillary butterflies that overwinter in special frost-resistant webs.

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Season 21 · Episode 3

Intelligence

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?

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