Blue Jay, Vol.50, Issue 1
FALL FOOD OF THE EASTERN SCREECH-OWL IN MANITOBA KURT M. MAZUR, 15 Attache Place, Winnipeg, Manitoba. R2V 3L3 The Eastern Screech-owl is one of site. Through examination of the prey the most widespread owls in North remains, an owl’s diet can be ac¬ America.4 It ranges from the Gulf of curately quantified.6,8 Mexico north to southern Manitoba, and from Montana to the east coast Starting 13 October 1990, 40 nest of the United States.14 This small boxes were checked for prey (20-24 cm) highly nocturnal owl has remains. Five of these contained pel¬ a diet that is quite varied over its lets and/or bones and feathers, range and throughout the presumably the prey of the resident season.1,4,5,11'12,15,16,18 Several screech-owl. These five boxes, and studies of the Eastern Screech-owl’s the surrounding areas, were checked diet have been published, but none once a week from 13 October to 4 from the northern edge of its November 1990. range.5,15,16,18 Reports of Eastern Screech-owls in Manitoba occur as Prey were identified to species far north as Riding Mountain National when possible. Mean individual prey Park.1 weight was estimated by taking the average weight of five individuals of This study was done near Win¬ each species from the same time of nipeg in autumn, a time when num¬ year, based on data from Manitoba bers and types of prey available are specimen collections.9 From these changing.7,13,16 The study area was individual prey weights a percent in La Barriere Park along the La total weight was calculated for the Salle River, just south of Winnipeg.
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