The migration journey of the swallow is a necessity for its survival as a species, and it is an astonishing piece of travelling -just how does he do it? Producer Dave Sheasby
Discover 11,128,835 listings and 277,884 playable programmes from the BBC
The migration journey of the swallow is a necessity for its survival as a species, and it is an astonishing piece of travelling -just how does he do it? Producer Dave Sheasby