![]() ![]() dietary evenness and richness were much higher for Boobooks. Standardised Food Niche Breadth for Powerful Owls was 0.115, and for Southern Boobooks 0.325 i.e. GMPW calculated from a previous study in Canberra of Southern Boobooks Ninox novaseelandiae was 2.11 g, and the prey/predator weight ratio was 0.008, much lower than for Powerful Owls. Geometric Mean Prey Weight (GMPW) of Powerful Owl prey (including four items from a previous Namadgi analysis) in the ACT was 176.48 g, and the prey/predator weight ratio was 0.118. Its behaviour was affected by mobbing by diurnal birds. It was seen attacking Sugar Gliders and adult Brushtail Possums, but beak-clacking when attacking the Brushtail Possums (so apparently attacking them as competitors, not prey). This Owl was observed perching on prey items on 11.9% of the days it was seen: seven times on Sugar Gliders, twice on Ringtail Possums, and twice on Brushtail Possums. An Owl at the Botanic Gardens took 41 Sugar Gliders, 10 Common Ringtail Possums Pseudocheirus peregrinus and two juvenile Common Brushtail Possums Trichosurus vulpecula, the last apparently off the females’ backs. Among avian prey, the Bassian Thrush Zoothera lunulata is a new record for Powerful Owls. A pair in Namadgi National Park took five Sugar Gliders Petaurus breviceps, a Greater Glider Petauroides volans, birds and a crustacean. Fruit-bats, Common Ringtail Possums and Scaly. The diet of three Powerful Owls Ninox strenua in the Australian Capital Territory was studied in 2007. Eight mammal, sixteen bird and two insect species were recorded as prey, ranging in weight from 1 kg to 2 g. ![]()
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