The Contents of Owl Pellets as Indicators of Habitat Preferences of Small Mammals

Abstract

In studies of the habitat preferences of small mammals it has been found that an analysis of the contents of owl pellets is of some significance. During the last six years (1930-'36) the writer has carried on considerable trapping for small mammals on mixed prairie, along streams, in sandy areas, on short grass, and on tall grass areas, to determine habitat preferences. Of course, owls in their hunt for food make no sharp distinctions in habitats. Their hunting and collecting of food is done over definite habitats only, broadly speaking. But by finding owl nests in areas predominantly of one general, environmental character, helpful information has been obtained. As is well known, owls swallow their small mammal food whole; then the indigestible portions are formed into pellets in the stomach and regurgitated. These pellets are composed largely of hair and bones. And by means of these materials the owl food can be determined.