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Birds of Indian Subcontinent

Roosting Behaviour of the Jackdaw Corvus monedula at Örebro, Central Sweden

Publication Type:Journal Article
Year of Publication:1976
Authors:Gyllin, R, Källander, H
Journal:Ornis Scandinavica
Volume:7
Issue:1
Date Published:1976
ISBN Number:00305693
Keywords:Coloeus, Coloeus monedula, Corvidae, Corvus, Corvus monedula, Sweden
Abstract:Jackdaws Corvus monedula roosting in the town of Örebro, Central Sweden, were studied from autumn 1956 to autumn 1961. Roosting occurred from mid-summer to March/April. Six distinct flight lines were used. The highest total, about 7,000 birds, was recorded in mid-winter. Maximum travelling distance was 35 km. Flights to the roost took place much earlier in relation to sunset in summer than in winter. In mid-winter up to 15 per cent of the day-time was spent flying to and from the roost. Persistent persecution had only temporary effect. A breeding-time roost outside Örebro was used from March/April to July. Hypotheses regarding the adaptive significance of communal roosting and of roosting in town centres are discussed.
URL:http://www.jstor.org/stable/3676179
Short Title:Ornis Scandinavica
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