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- Title
Behaviour in the post-nestling dependence period of radio-tagged Common Buzzards Buteo buteo.
- Authors
TYACK, A. J.; WALLS, S. S.; KENWARD, R. E.
- Abstract
Behaviour of 26 young Common Buzzards Buteo buteo was studied by systematic radiotracking during July and August 1991. After hatching between 11 May and 18 June, the young buzzards fledged when they were 43-54 days old. Distances travelled from the nest increased abruptly after birds were 65 days old, when their flight feathers had completed growth: buzzards were located more than 500 m from the nest in only 2% of records within 65 days of hatching but in 26% of records when they were older. Before their 65th day, there was an increase with age in distance from the nest, time spent flying and time spent calling, especially for buzzards with continuous woodland around the nest. The increases in distance and areas covered were greatest for broods where parents were most often present, which was at nests with the most grass and arable farmland nearby. Between their 65th and 100th days, buzzards showed no increase in activity with age and called less, especially where there was extensive woodland, and travelled farthest from nests with least neighbouring grassland; broods with few young most often had parents nearby. Young buzzards associated strongly with each other between leaving the nest and completing feather growth, but some broods later became much less cohesive. Variation in activity was not linked to sex or to the presence of 30 g back-pack radio-tags compared with 12-g leg-mounted radio-tags.
- Publication
Ibis, 1998, Vol 140, Issue 1, p58
- ISSN
0019-1019
- Publication type
Article
- DOI
10.1111/j.1474-919X.1998.tb04541.x