Factors Affecting Egg Predation by American Crows

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Abstract
We studied predation by breeding American crows (Corvus brachyrhynchos) on artificial duck nests in upland and overwater habitats from April to July in 1986 and 1987 in the prairie pothole region of southwestern Manitoba, Canada. Predation was higher on nests placed within home ranges of breeding crows that on nests placed at random locations outside of home ranges. However, artificial nests placed > 700 m from crow nests, yet with home ranges, were relatively safe from predation. Predation was greater on upland than on overwater nests. Nests in low vegetation were most vulnerable to crows, but increases in cover height above 20-50 cm did not substantially reduced predation.

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