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Diet of Northern Saw-Whet Owls in Southern Wisconsin
Scott R. Swengel and Ann B. Swengel
Vol. 94, No. 3 (Aug., 1992), pp. 707-711
Published by: Cooper Ornithological Society
Stable URL: http://www.jstor.org/stable/1369255
Page Count: 5
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We measured and analyzed 1,148 pellets of Northern Saw-whet Owls (Aegolius acadicus) in Sauk County, Wisconsin from 1986 to 1990. Pellets averaged 3.03 cm long × 1.50 cm wide, and contained 0.645 prey individuals/pellet. Rodents comprised 84.5% of prey individuals and 92.0% of biomass in Saw-whet Owl diets. Deer mice (Peromyscus leucopus and P. maniculatus) comprised 67.7%, voles (Microtus pennsylvanicus and M. ochrogaster) 16.1%, and shrews (Blarina brevicauda and Sorex cinereus) 8.6% of prey individuals. The owls also ate songbirds, insects, and a bat. The owls' food-niche breadth was 2.17.
The Condor © 1992 Cooper Ornithological Society