Male Eastern Screech-owl (Otus asio) roosting behavior: possible effects from nesting stage and nest type

Abstract

This study examined the diurnal roosting behavior of male Eastern Screech-owls (Otus asio) and proposed some possible functions for this behavior. As part of a nest defense study, male diurnal roost locations were marked and, later, the distance to the corresponding nest was measured. Male screech-owls roosted significantly closer to their nests during the nestling stage than during the egg stage. Additionally, males associated with nests in natural cavities roosted significantly closer to their nests than did males with nests in nest boxes. Comparison of nest sites showed significantly fewer trees in front of occupied nest boxes, compared to nests in natural cavities. Although the exact function of reducing roost distance is not known, male screech-owls may shift daytime roost locations closer to their nests for anti-predator purposes.

Parent Publication

• Biology and conservation of owls of the Northern Hemisphere: 2nd International symposium

Citation

Sproat, Thomas McK. 1997. Male Eastern Screech-owl (Otus asio) roosting behavior: possible effects from nesting stage and nest type. In: Duncan, James R.; Johnson, David H.; Nicholls, Thomas H., eds. Biology and conservation of owls of the Northern Hemisphere: 2nd International symposium. Gen. Tech. Rep. NC-190. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 408-410.