Southern boobook smallest owl on the Australian mainland, the southern boobook is long. The nominate subspecies is the largest. It has short, rounded wings and a short tail, with a compact silhouette in flight. Southern boobooks on the Australian mainland follow Bergmann's rule, in that birds from cooler and more southerly parts of the range tend to be larger. Thus, birds from the Canberra region weigh around while those from the Cape York Peninsula and Broome are around . Females tend to be a little larger and heavier than males, with males weighing and females . The southern boobook has generally dark
Royal Australasian Ornithologists Union the title of Fellow of the Royal Australasian Ornithologists Union (FRAOU) to a small and limited number of individuals. It also recognises excellence in contributions to ornithological knowledge through annual awards: the D.L. Serventy Medal for outstanding published work on birds in the Australasian region, and the John Hobbs Medal for major contributions to amateur ornithology. Royal Australasian Ornithologists Union The Royal Australasian Ornithologists Union, now part of BirdLife Australia, was founded in 1901 to promote the study and conservation of the native bird species of Australia and adjacent regions. This makes it Australia's oldest national birding association. It was