I support a group called the Optimum Population Trust which campaigns to reduce birth rates because I think, if we keep on growing, we're not only go… - David Attenborough

Birds were flying from continent to continent long before we were. They reached the coldest place on Earth, Antarctica, long before we did. They can survive in the hottest of deserts. Some can remain on the wing for years at a time. They can girdle the globe. Now, we have taken over the Earth, and the sea, and the sky. But with skill and care and knowledge, we can ensure that there is still a place on Earth for birds in all their beauty and variety, if we want to, and surely, we should.

Human beings are good at many things, but thinking about our species as a whole is not one of our strong points. m4s45-m4s53

Its heart that in flight contracted a thousand times a minute, slows until its beat is virtually undetectable. Its body temperature falls dramatically, and its breathing seems to cease altogether. [...] It's hibernating; but for a hummingbird, winter comes 365 times a year.