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- Title
BREEDING PHENOLOGY AND SUCCESS OF BLACK SWIFTS IN BOX CANYON, OURAY, COLORADO.
- Authors
Hirshman, Sue E.; Gunn, Carolyn; Levad, Richard G.
- Abstract
This study presents 11 years of nesting success and phenology data for Black Swifts (Cypseloides niger) at Box Canyon in Ouray, Colorado. Nest data were recorded on a near-daily basis for 160 nest attempts. Nesting success was 72% and mean and extreme dates of nesting events, including arrival, egg-laying, onset of incubation, hatching, and fledging are reported. On average, Black Swifts arrived on 13 June, egg laying started on 28 June, incubation started on 1 July, hatching occurred on 26 July, and fledging occurred on 13 September. The average incubation period was 26 days and the nestling phase was 48 days. In seven instances, a second egg appeared after loss of the first egg and, in one case, a third egg appeared. It was not possible to ascertain whether second or third eggs represented a renesting attempt or nest usurpation.
- Subjects
BOX Canyon (Ouray County, Colo.); OURAY County (Colo.); COLORADO; BREEDING; PHENOLOGY; SWIFTS
- Publication
Wilson Journal of Ornithology, 2007, Vol 119, Issue 4, p678
- ISSN
1559-4491
- Publication type
Article
- DOI
10.1676/06-112.1