Ecology

Habitat

Habitat and Ecology

Systems
  • Terrestrial
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2012

Assessor/s
BirdLife International

Reviewer/s
Butchart, S. & Symes, A.

Contributor/s

Justification
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend is not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
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Population

Population
The global population size has not been quantified, but the species is described as common (Morcombe 2000).

Population Trend
Unknown
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Wikipedia

Grey butcherbird

The grey butcherbird (Cracticus torquatus) is a widely distributed species endemic to Australia. The grey butcherbird occurs in a range of different habitats including arid, semi-arid and temperate zones. It has a characteristic "rollicking" birdsong. It appears to be adapting well to city living, and can be encountered in the suburbs of many Australian cities including Sydney and Brisbane. The grey butcherbird preys on small vertebrates including other birds.

Other birds in the same family include the Australian magpie, the currawongs, woodswallows and other members of the butcherbird genus Cracticus.

Taxonomy[edit]

Juvenile

Closely related species include the silver-backed butcherbird (Cracticus argenteus) and the black-backed butcherbird (Cracticus mentalis). The silver-backed butcherbird (Cracticus argenteus) from Arnhem Land and northwestern Australia over to Port Hedland, originally described by John Gould in 1841, was later deemed to be a subspecies of the grey butcherbird. Recently, however, it has again been re-described as a separate species. The silver-backed butcherbird has two subspecies C. argenteus argenteus and C. a. colletti. The black-backed butcherbird occurs in Australia on the Cape York Peninsula and in Papua New Guinea and has two subspecies.[2]

Subspecies[edit]

The grey butcherbird has three subspecies:[2]

  • C. t. torquatus in south-east Australia.
  • C. t. cinereus is restricted to the island of Tasmania.
  • C. t. leucopterus is widespread; its distribution stretches from the west to the east coast of Australia.

Gallery[edit]

References[edit]

  1. ^ BirdLife International (2012). "Cracticus torquatus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013. 
  2. ^ a b Schodde, Richard; Mason, I.J. (1999). The Directory of Australian Birds : Passerines. A Taxonomic and Zoogeographic Atlas of the Biodiversity of Birds in Australia and its Territories. Collingwood, Australia: CSIRO Publishing. ISBN 9780643102934. 
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