David Attenborough's Natural Curiosities - Season 2 Episode 10 Magical Appearances
7.30 48 minutes "Magical Appearances" explores how swallows magically appear each spring and asks how did complex and beautiful insects like butterflies suddenly arrive in the summer.
The discovery of the swallow’s epic migration and the revelation that butterflies could metamorphose into totally different looking adults were scientific stories both cloaked in mystery and controversy.
