Christmas boobook lores and throat, yellow eyes, legs and feet. It is approximately 26–29 cm in length and 130-190 grams in weight with the female slightly larger than the male. The double-noted hoot, "boo-book," has a clucking quality with the second note usually lower in pitch. The begging call of juveniles is a high-pitched trill. Vocalisations are similar to those described for the Southern Boobook "N. novaeseelandiae" and include individual variation in advertisement calls. This may be useful in estimating owl densities as radio-tracking can be impractical in some terrains. A recording, courtesy of Richard Hill and Owl Pages http://www.owlpages.com/sounds/Ninox-natalis-2.mp3 Its natural
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