LIVER, n. A large red organ thoughtfully provided by nature to be bilious with. The liver is heaven's best gift to the goose; without it that bird would be unable to supply us with the Strasbourg "pate".
Every bird which flies has the thread of the infinite in its claw. Germination includes the hatching of a meteor and the tap of a swallow's bill breaking the egg, and it leads forward the birth of an earth-worm and the advent of Socrates.
Archaeopteryx probably cannot tell us much about the early origins of feathers and flight in true protobirds because Archaeopteryx was, in the modern sense, a bird.