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 Arachnological Society Australasian Arachnological Society The Australasian Arachnological Society is a body dedicated to promotion of knowledge and study of arachnids (spiders and other 8-legged arthropods) in the Australasian realm, which includes Australia, New Zealand, South-east Asia, Oceania and the Pacific Islands. Membership is open to all individuals and scientific institutions. The Society maintains a large library of reference books and scientific journals housed at Queensland Museum. The society is informally structured to promote the study of arachnology to amateurs, students, professionals and institutions. The Society was founded by Robert Raven in 1979. The first national meeting was held in 1989 as