Summary: Feathers can keep you warm, and help birds to fly and find a mate. We're speaking to the American biologist Thor Hanson about his book 'Feathers: The Evolution of a Natural Miracle'.
Summary: Feathers can keep you warm, and help birds to fly and find a mate. We're speaking to the American biologist Thor Hanson about his book 'Feathers: The Evolution of a Natural Miracle'.