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Chris Sperring is in mid-Sweden in search of wolves, following their tracks in the snow.
BBC Radio 4
Chris Sperring is in the Swedish taiga looking for the hawk owl.
BBC Radio 4 FM
Trai Anfield heads to RSPB Old Moor reserve to seek out the once-common tree sparrow.
Living World visits a flooded meadow in Hampshire where 2000 godwits spend the winter.