Grünarassaris
| Grünarassaris | ||||||||
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Leek arassari ( Aulacorhynchus prasinus ) |
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| Systematics | ||||||||
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| Scientific name | ||||||||
| Aulacorhynchus | ||||||||
| Gould , 1835 |
Grünarassaris ( Aulacorhynchus ) are a genus of birds from the family of toucans (Ramphastidae) within the woodpecker birds (Piciformes). The genus includes six species. The IUCN classifies a kind, namely the Gelbbrauenarassari as endangered ( endangered one). The range of this species is very small and coca growers have settled in the range of this species , so it can be assumed that the area that offers the yellow-browed macaws a suitable habitat is shrinking. The IUCN estimates the population at 1,000 to 2,499 sexually mature individuals. The other species are classified by the IUCN as 
(= least concern - not endangered).
description
All species reach a height of 38 to forty centimeters. They have predominantly green plumage with blue markings on the head. The tail is straight, most species have brown tail tips of the central feathers. The beak is furrowed on the side and large in proportion to its height, as is normal in this family. The throat is white, gray, or blue. The underside of the tail and the tip of the tail feathers stand out in red in some species. There is no noticeable sexual dimorphism , but females have significantly smaller beaks. The difference in size from the males can be up to twenty percent. The individual species differed mainly in their beak color and their vocalizations.
Way of life
The mode of reproduction is only well documented in the blood rump arassari and the leek arassari. A large part of the knowledge about the blood rump arassari comes from captivity. Blood rump macaws breed mainly in old woodpecker holes. The openings are occasionally enlarged by them. Blood-eared macaws in captivity lay up to four white eggs. The breeding season is 16 to 17 days. The laying interval is about a day, and blood-tailed macaws begin to breed before the last egg is laid. Both parent birds are involved in the brood, but the female parent bird has the greater share of the breeding business. Newly hatched nestlings are initially naked and pink. They are only slightly bluish above the eyes that are still closed. Feed both parent birds. The nestlings' diet initially consists of insects, fruits and small birds. The droppings are removed from the nesting holes by the parent birds. The fledglings fledge at around seven weeks of age. After the fledgling, the young birds return for a while to rest and the parent birds feed their offspring for a period of several weeks after they fled. Presumably, the young birds will stay close to the parent birds until the next breeding season. For other species, such as the rare yellow-browed arassari, not even the exact breeding time is known.
distribution and habitat
They inhabit mountain forests from southern Mexico to Bolivia and Guyana . They prefer heights from 900 to 3000 m and more. They are adapted to strong temperature fluctuations due to their dense plumage and move to deeper regions in winter.
species
- Derby arassari ( A. derbianus )
- Blood rump arassari ( A. haematopygus )
- Yellow- browed macaws ( A. huallagae )
- Gray-billed macaws ( A. coeruleicinctis )
- Leek arassari ( A. prasinus )
- Blue-bridled macaws ( A. sulcatus )
supporting documents
literature
- The modern animal lexicon , Volume 1, p. 130, Bertelsmann Lexikon Institut
- Bernhard Grzimek : Grzimeks animal life. Volume 9 birds. Deutscher Taschenbuch Verlag GmbH & Co. KG, Munich 1993, p. 78, ISBN 3-423-05970-2
- Werner Lantermann: Toucans and Arassaris. Filander Verlag, Fürth 2002, ISBN 3-930831-46-5
- Lester L. Short and Jennifer FM Horne: Toucans, Barbets and Honeyguides - Ramphastidae, Capitonidae and Indicatoridae . Oxford University Press, Oxford 2001, ISBN 0-19-854666-1
Web links
- world-of-animals.de , accessed on January 20, 2010
Single receipts
- ↑ BirdLife factsheet on the yellow-browed macaw , accessed December 29, 2012
- ↑ Lantermann, p. 101
- ↑ Short et al., P. 338
- ↑ Short et al., P. 338