Southern boobook age. Brushtail possums ("Trichosurus" spp.) and introduced cats and rats raid the nests for nestlings and eggs, and raptors such as the brown goshawk ("Accipiter fasciatus"), grey goshawk ("Accipiter novaehollandiae"), Australian masked owl ("Tyto novaehollandiae"), and probably powerful owl ("Ninox strenua") seize young birds. Juvenile southern boobooks are at greater risk after bushfires and have perished after being tangled up in dodder ("Cassytha") or bidgee-widgee ("Acaena novae-zelandiae"). The southern boobook generally preys on mice, insects, particularly nocturnal beetles and moths, and birds the size of a house sparrow ("Passer domesticus"). A higher proportion of its diet is invertebrates compared with
Australasian figbird for example parrots and other species of orioles. The song consists of a series of simple whistles. As suggested by their name, Australasian figbirds are largely frugivorous, but also take small insects, nectar and small seeds. While largely a resident species (although the southern population may be migratory), it is nomadic in response to the availability of food. Unlike most orioles, Australasian figbirds are gregarious, often forming flocks of 20 to 40 birds during the non-breeding season, and even breeding in small, loose colonies. The flimsy saucer-shaped nest is made from plant-material, and usually placed relatively high in a tree.