Winterwatch in Wales

BBC Two Wales HD

7:00 PM to 7:30 PM

Wednesday 26 February

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Iolo Williams explores the various strategies that animals use to survive harsh winters, including the adaptations that mean ducks' feet don't freeze and pond creatures can survive under ice. He 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