Can you imagine any better example of divine creative accomplishment that the consummate flying machine that is a bird? The skeleton, very flexible and strong, is also largely pneumatic -- especially in the bigger birds. The beak, skull, feet, and all the other bones of a 25-pound pelican have been found to weigh but 23 ounces.

-- Guy Murchie, Jr, 'Song of the Sky, 1954.
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