This section is from the book "The Wonder Book Of Knowledge", by Henry Chase. Also available from Amazon: Wonder Book of Knowledge.
Nature has provided the duck with a protection against water just as she has so wisely protected all animals against such elements as they have to live in.
The feathers on a duck are very heavy and close together, and at the bottom of each feather is a little oil gland that supplies a certain amount of oil to each feather. This oil sheds the water from the back of a duck as soon as it strikes the feathers.
Canvasback ducks are considered the finest of the water-fowls for the table. The canvasback duck is so called from the appearance of the feathers on the back. They arrive in the United States from the north about the middle of October, sometimes assembling in immense numbers. The waters of Chesapeake Bay are a favorite locality for them. Here the wild celery, their favorite food, is abundant, and they escape the unpleasant fishy flavor of the fish-eating ducks.
 
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