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Predation by Common Ravens on Cliff-Nesting Black-Legged Kittiwakes on Baccalieu Island, Newfoundland

Alan D. MacCarone
Colonial Waterbirds
Vol. 15, No. 2 (1992), pp. 253-256
Published by: Waterbird Society
DOI: 10.2307/1521463
Stable URL: http://www.jstor.org/stable/1521463
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Predation by Common Ravens on Cliff-Nesting Black-Legged Kittiwakes on Baccalieu Island, Newfoundland
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Abstract

I observed the hunting activities of a pair of Common Ravens (Corvus corax) in a large mixed-species seabird colony located on Baccalieu Island, Newfoundland. Ravens made a total of 169 hunting patrols along the cliff face during 57 hours of observations over a five-week period in 1979. Of these, 12 patrols were successful (7.1%), with four eggs and eight chicks stolen from Black-legged Kittiwake (Rissa tridactyla) nests. Patrols by a single bird (n = 117) were more common and more successful (8.5%) than those by the pair (n = 50, 4.0% success). The frequency of patrols (X̄ = 3.0/h) did not differ significantly throughout the day or during the study period. Ravens were more likely to patrol along upper portions of the cliff face than along either middle or lower areas; however, predation success was significantly greater on nests at lower elevations.

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