Dawn chorus (birds)
The dawn chorus occurs when songbirds 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. 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.
International Dawn Chorus Day
An annual International Dawn Chorus Day is held on the first Sunday in May where the public are encouraged to rise early to listen to bird song, at organised events. The first ever was held at Moseley Bog in Birmingham, England in 1984, by the Urban Wildlife Trust.
Early explorers and European settlers noted that the New Zealand forest had a loud dawn chorus. This is no longer the case due to extensive loss of forests and the introduction of bird predators and competing species such as wasps. The bellbird and the tui are two of the birds that would have formed part of the dawn chorus since they have a vocal and melodious call.
A recording of a dawn chorus in the UK
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In the UK the dawn chorus may begin as early as 4am in early summer. The most often heard species of birds are, in order of them beginning to sing:
- Tawny Owl
- Common Pheasant
- Warblers, including Blackcap, Chiffchaff, Garden Warbler and Willow Warbler
- Song Thrush
- 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
- Moller, A.P., (1992). Interspecific response to playback of bird song. Ethology, 90: 315-320. DOI: 10.1111/j.1439-0310.1992.tb00842.x
- 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
- Gregg, Emma and Trillo, Richard (2003) Rough guide to the Gambia Rough Guides, New York, page 220, ISBN 1-84353-083-X
- Lowman, Margaret; Burgess, Edward and Burgess, James (2006) It's a jungle up there: more tales from the treetops Yale University Press, New Haven, Connecticut, page 168, ISBN 0-300-10863-X