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
Australasian Society of Clinical Immunology and Allergy Australasian Society of Clinical Immunology and Allergy The Australasian Society of Clinical Immunology and Allergy is a professional body of clinical immunologists, allergy specialists and immunology scientists in New Zealand and Australia that aims to "advance the science and practice of clinical immunology and allergy, by promoting education and the highest standard of ethical medical practice." It was formed in 1991 by the merging of the Australian College of Allergy with the Australasian Society of Immunology Clinical Immunology Group. It publishes guidelines and position statements on the management of allergies and sensitivities, provides in-person and online training, and hosts conferences.