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The choughs pyrrhocorax pyrrhocorax of bardsey uk

The choughs pyrrhocorax pyrrhocorax of bardsey uk

British Birds 78(5): 217-232

Data are interpreted from a color-ringing study of choughs P. pyrrhocorax during 1978-1983 on Bardsey, Gwynedd, and these are combined and compared with analyses of national ringing recoveries, county records, and reference to other literature. Breeding choughs are sedentary, with great nest-site and pair fidelity. First-years can show much more mobility, dispersing up to 70 km within the breeding range and 140 km outside it; extreme distances wandered by unaged individuals are up to 360 km. A 1st yr mortality rate of 75% is suggested, although this figure is shown to vary greatly annually. Adult longevity was in 1 case 17 yr. First breeding is generally in the 4th yr, but instances of breeding in the 2nd and 3rd yr are known away from Bardsey. Notes on flocking and roosting behavior are made. Biometric data show clear size differences between the sexes, and between 1st yr and older choughs.

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