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David Attenborough's Natural Curiosities

Series 2

Episode 11: Magical Appearances

Duration: 23 minutes

on BBC Two HD

Where do swallows hibernate and where do butterflies appear from in spring? The mystery of where some animals disappear to each year puzzled early naturalists. Show more

BBC Two HD

About BBC Two

BBC Two is a lively channel of depth and substance, carrying a range of knowledge-building programming complemented by great drama, comedy and arts.