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".
I read the Bible and know little of its history, but the human beings who wrote it were instruments of Divine Power, and Jesus forged a far stronger bond than the ten commandments: love. Birds and monkeys, or any of God's creatures, obey their instincts and merely do what they're programmed to do. In the case of the human being, things are more complicated because we know about love and its traps.
The caged bird sings with a fearful trill, of things unknown, but longed for still, and his tune is heard on the distant hill, for the caged bird sings of freedom.
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.
Oh, nature's noblest gift, my grey goose quill, Slave of my thoughts, obedient to my will, Torn from the parent bird to form a pen, That mighty instrument of little men.