David Attenborough's natural curiosities. Series 2, Episode 10, Magical appearances / presented by David Attenborough ; produced & directed by Sharmila Choudhury.
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. About the series: David Attenborough has spent a lifetime documenting the natural world, meeting a great number of extraordinary creatures....
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