Owls are difficult to detect and count because they occur at low densities, are nocturnal, and
move rapidly over large areas (Fuller and Mosher 198 1). Because many owls nest in
inconspicuous cavities, standard survey techniques such as nest searches and aerial counts
are of limited value. The Barred Owl (Strix vuria) has recently been selected as a
management indicator species for several national forests. Thus, an efficient means of
monitoring Barred Owl populations is required. Fuller and Mosher (1981) suggested a …