Sleeping Duck Behavior
Why do ducks tuck their bills under their feathers while they sleep?
Why do they stand on one leg?
An interesting question. The best answer I have found so far is that they
reduce exposure of unprotected areas of the body - the bill and feet - by
tucking them into feathers. A sleeping bird will occasionally alternate the
foot held up. There is some interesting information on the web and in books
about level of alertness to danger while sleeping, but not much about the
posture. Many other types of birds share these sleeping traits.
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Update: June 2012