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
1977 Australasian Individual Speedway Championship England. Ivan Mauger would go on to win his record equalling 5th World Championship later in the year at the Ullevi stadium in Göteborg, Sweden. 1977 Australasian Individual Speedway Championship The 1977 Australasian Individual Speedway Championship was the second annual Australasian Final for Motorcycle speedway riders from Australia and New Zealand as part of the qualification for the 1977 Speedway World Championship. The Final took place at the Sydney Showground. Four time World Champion Ivan Mauger was the winner after defeating Phil Crump and defending Australasian Champion John Boulger in a runoff after all three riders finished on 14 points.