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Dawn chorus (birds)
The dawn chorus occurs when birds sing at the start of a new day. In temperate countries this is most noticeable in spring when the birds are either defending a breeding territory or trying to attract a mate. In a given location, it is common for different species to do their dawn singing at different times. In a study of the Ecuadoran forest, it was determined that birds perching higher in the trees and birds with larger eyes tend to pipe up first.〔Jamieson, Barrie Gillean Molyneux (editor) (2007) ''Reproductive Biology and Phylogeny of Birds: Sexual selection, behavior, conservation, embryology, genetics'' (Part B of ''Reproductive Biology and Phylogeny of Birds'') Science Publishers, Enfield, New Hampshire, page 183, ISBN 978-1-57808-386-2〕 These correlations may be caused by the fact that both would also correlate with the amount of light perceived by the bird.〔
Moller used a play-back technique to investigate the effects of singing by the black wheatear (''Oenanthe leucura'') on the behaviour of both conspecifics and heterospecifics. It was found that singing increased in both groups in response to the wheateater and Moller suggested the dawn (and dusk) chorus of bird song may be augmented by social facilitation due to the singing of conspecifics as well as heterospecifics.〔Moller, A.P., (1992). Interspecific response to playback of bird song. Ethology, 90: 315-320. DOI: 10.1111/j.1439-0310.1992.tb00842.x〕
In some territories where bird life is extensive and birds are vocal, the sound of a dawn chorus can render early morning sleeping difficult.〔Carson, Rachel and Freeman, Dorothy (1995) ''Always, Rachel: the letters of Rachel Carson and Dorothy Freeman, 1952-1964'' Beacon Press, Boston, Massachusetts, page 462, ISBN 0-8070-7010-6〕〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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