A spider. Quite big enough and succulent enough to provide a snack for a Scops. - David Attenborough

Without thermals, [raptors] can't travel far. But the snow geese fly on... They navigate by the stars.

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.

Each [pelican] has already survived many perils in its young life. As a chick, it fought battles with its brothers and sisters and won.