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
Discover 11,128,835 listings and 279,903 playable programmes from the BBC
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 is a lively channel of depth and substance, carrying a range of knowledge-building programming complemented by great drama, comedy and arts.
