In pictures: Into the Air
Some more amazing images from episode 3
Comparing a human and bat hand
A human and a bat hand share the same blueprint but have evolved very differently.
A young male penguin at Bristol Zoo displays to Ben.
Under the sea with penguins
Penguins have very dense bones and can swim at speeds of up to 22mph.
Lloyd Buck and Smudge the pigeon
Bird trainer Lloyd Buck and his pigeon Smudge meet Ben.
A pigeon's present and future
Smudge the pigeon possibly contemplates her own mortality by inspecting this skeleton.
A pigeon can fly vertically for over 20 metres.
Close-up with an emu
Emus are the second largest living bird on the planet, but have tiny wings.
Reading an ostrich femur reveals its evolutionary history as a flying bird.
Ancient flying pterosaur
Pterosaurs were the largest flying animals ever, with a wingspan of up to 10m.
Ben articulates a gannet wing in his workshop.