Episode 4

Iolo's on a mission to see one of the most photogenic birds in the UK - the black-throated diver.

Live updates from Chris and Michaela in Norfolk - is there any sign of the elusive and rare turtle dove? Gillian enters the twilight zone to check out a British shark that can glow in the dark. And find out why water voles are choosing city life over country living. 

Cast Appearances

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