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 Bird vocalization

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kosovohp
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PostSubject: Bird vocalization   Fri Oct 01, 2010 5:52 pm

Birds communicate using primarily visual and auditory signals. Signals can be interspecific (between species) and intraspecific (within species).

Birds sometimes use plumage to assess and assert social dominance,[112] to display breeding condition in sexually selected species, or to make threatening displays, as in the Sunbittern's mimicry of a large predator to ward off hawks and protect young chicks.[113] Variation in plumage also allows for the identification of birds, particularly between species. Visual communication among birds may also involve ritualised displays, which have developed from non-signalling actions such as preening, the adjustments of feather position, pecking, or other behaviour. These displays may signal aggression or submission or may contribute to the formation of pair-bonds.[39] The most elaborate displays occur during courtship, where "dances" are often formed from complex combinations of many possible component movements;[114] males' breeding success may depend on the quality of such displays.[115]
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Troglodytes aedon.ogg
Call of the House Wren, a common North American songbird

Bird calls and songs, which are produced in the syrinx, are the major means by which birds communicate with sound. This communication can be very complex; some species can operate the two sides of the syrinx independently, allowing the simultaneous production of two different songs.[53] Calls are used for a variety of purposes, including mate attraction,[39] evaluation of potential mates,[116] bond formation, the claiming and maintenance of territories,[39] the identification of other individuals (such as when parents look for chicks in colonies or when mates reunite at the start of breeding season),[117] and the warning of other birds of potential predators, sometimes with specific information about the nature of the threat.[118] Some birds also use mechanical sounds for auditory communication. The Coenocorypha snipes of New Zealand drive air through their feathers,[119] woodpeckers drum territorially,[50] and Palm Cockatoos use tools to drum

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