Muir's corella

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Muir's corella
Western Corella.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Psittaciformes
Family: Cacatuidae
Genus: Cacatua
Species:
Subspecies:
C. p. pastinator
Trinomial name
Cacatua pastinator pastinator
(Gould, 1841) [1]

Muir's corella (Cacatua pastinator pastinator) is a stocky, medium-sized white cockatoo endemic to Western Australia. It was the threatened nominate subspecies of the western corella. [2] It was removed from the WA's threatened species list in November 2012 as a result of successful conservation efforts. [3]

Contents

Description

Muir's corella has mainly white plumage with an erectile white crest. The undersides of the wings and tail are yellow. The feathers between the eye and beak are deep salmon-pink, as are the bases of the feathers on the head and underparts. The eye is surrounded by a broad grey-blue eye-ring. The white feathers are often stained with soil because of the birds’ foraging activities. The corellas have a wingspan of 90 cm, [4] and range from 43–48 cm in length and 560–815 g in weight. They have a variety of loud and raucous calls. [2] They are very similar in appearance to Butler's corella, the only other subspecies of the western corella, being slightly larger with a longer upper mandible.

Distribution and habitat

Muir's corella formerly inhabited woodlands and open country east of the main area of forest in south-western Western Australia, occurring north to the Swan and Avon Rivers, south to Albany and Augusta, and eastwards to the Stirling and Porongurup Ranges. The birds were distributed in small, widely separated colonies throughout this range. However, the population has declined and the subspecies now only occurs in the Lake Muir region where the remainder of the woodland habitat consists of fragmented remnants. [2]

Behaviour

Muir's corellas are gregarious and may be seen in flocks of ten to a thousand birds. They have traditional roosting sites, usually in dense timber, which they leave in the morning for their feeding areas and return to at night. [2]

Feeding

The corellas forage on the ground in large flocks and feed on a wide variety of seeds of both native and introduced plants, as well as corms and tubers which they dig up using the elongated upper mandibles of their bills. Cereal grains, including oats, barley and wheat, are eaten extensively in summer and autumn, while the corms of onion grass are important in winter and spring. [2] [4]

Breeding

The corellas nest in tree hollows of large, mature eucalypts, including jarrah and marri. Eggs are laid from September to November with a clutch size of 1–3. The incubation period lasts 26–29 days until fledging. [2]

During the breeding season the birds feed close to the nest tree. After fledging, the young birds and their parents join other family groups to form large flocks that disperse to summer feeding areas. At the end of summer, breeding adults return to their nest sites while immature birds form nomadic flocks. [2]

Status and conservation

Muir's corella is considered to be threatened because it consists of one relatively small and isolated population covering a fragmented range of about 3000 km2, with the actual area of occupancy being about 500 km2. [5] It is listed as Vulnerable under Australia's Environment Protection and Biodiversity Conservation Act 1999. [4] Population estimates vary; it may comprise up to 9000 individuals, [2] including only about 2500 mature birds, [5] having gradually recovered from a low of about 100 individuals in the 1940s after widespread shooting and poisoning in the late nineteenth and early twentieth centuries. [6] Average life expectancy of adults has been estimated at 17 years for males and 14 years for females, with most young birds dying before they reach breeding age of 3–5 years old. [2]

While current nest hollow and food availability are sufficient to sustain the population, changes in land use may threaten the corella where remnant vegetation and paddock trees are cleared to establish plantations of blue gum and other species. It is potentially threatened by competition from, and interbreeding with, a species introduced from south-eastern Australia, the closely related long-billed corella, which has nearby populations established from avicultural escapes and releases. [2] Other threats include illegal shooting and poisoning, as well as competition for nest hollows with feral honey bees. [6]

Because the corellas sometimes cause damage to crops, young trees, gardens, power lines and house fittings, the subspecies is a declared pest of agriculture. However, because it is listed as ‘rare or likely to become extinct’, it is illegal to destroy them, and damage mitigation measures must use non-lethal means. [2]

Related Research Articles

Cockatoo Any bird in the family Cacatuidae

A cockatoo is any of the 21 parrot species belonging to the family Cacatuidae, the only family in the superfamily Cacatuoidea. Along with the Psittacoidea and the Strigopoidea, they make up the order Psittaciformes. The family has a mainly Australasian distribution, ranging from the Philippines and the eastern Indonesian islands of Wallacea to New Guinea, the Solomon Islands and Australia.

Yellow-tailed black cockatoo Species of bird native to the south-east of Australia

The yellow-tailed black cockatoo is a large cockatoo native to the south-east of Australia measuring 55–65 cm (22–26 in) in length. It has a short crest on the top of its head. Its plumage is mostly brownish black and it has prominent yellow cheek patches and a yellow tail band. The body feathers are edged with yellow giving a scalloped appearance. The adult male has a black beak and pinkish-red eye-rings, and the female has a bone-coloured beak and grey eye-rings. In flight, yellow-tailed black cockatoos flap deeply and slowly, with a peculiar heavy fluid motion. Their loud, wailing calls carry for long distances.

Palm cockatoo

The palm cockatoo, also known as the goliath cockatoo or great black cockatoo, is a large smoky-grey or black parrot of the cockatoo family native to New Guinea, Aru Islands, and Cape York Peninsula. It has a very large black beak and prominent red cheek patches.

White cockatoo

The white cockatoo, also known as the umbrella cockatoo, is a medium-sized all-white cockatoo endemic to tropical rainforest on islands of Indonesia. When surprised, it extends a large and striking head crest, which has a semicircular shape. The wings and tail have a pale yellow or lemon color which is exposed when they fly. It is similar to other species of white cockatoo such as yellow-crested cockatoo, sulphur-crested cockatoo, and salmon-crested cockatoo, all of which have yellow, orange or pink crest feathers instead of white.

Red-vented cockatoo

The red-vented cockatoo, also known as the Philippine cockatoo and locally katala, abukay, agay or kalangay, is a critically endangered species of cockatoo that is endemic to the Philippines. It is roughly the size and shape of the Tanimbar corella, but is easily distinguished by the red feathers around the vent.

Long-billed corella

The long-billed corella or slender-billed corella is a cockatoo native to Australia, which is similar in appearance to the little corella and sulphur-crested cockatoo. This species is mostly white, with a reddish-pink face and forehead, and has a long, pale beak, which is used to dig for roots and seeds. It has reddish-pink feathers on the breast and belly.

Sulphur-crested cockatoo

The sulphur-crested cockatoo is a relatively large white cockatoo found in wooded habitats in Australia, New Guinea, and some of the islands of Indonesia. They can be locally very numerous, leading to them sometimes being considered pests. A highly intelligent bird, they are well known in aviculture, although they can be demanding pets.

Solomons cockatoo

The Solomons cockatoo, also known as the Ducorps's cockatoo, Solomons corella or broad-crested corella, is a species of cockatoo endemic to the Solomon Islands archipelago. This small white cockatoo is larger than the Tanimbar corella yet smaller than the umbrella cockatoo. The species is common across most of the Solomons, absent only from Makira in the south. It inhabits lowland rainforests, secondary forests, cleared areas and gardens.

Little corella

The little corella, also known as the bare-eyed cockatoo, blood-stained cockatoo, short-billed corella, little cockatoo, and blue-eyed cockatoo, is a white cockatoo native to Australia and southern New Guinea. It was known as Birdirra among the Yindjibarndi people of the central and western Pilbara. They would keep them as pets, or traditionally cook and eat them. The downy feathers are used in traditional ceremonies and dances where they adorn head and armbands.

Orange-bellied parrot Species of bird

The orange-bellied parrot is a small parrot endemic to southern Australia, and one of only three species of parrot that migrate. It was described by John Latham in 1790. A small parrot around 20 cm (8 in) long, it exhibits sexual dimorphism. The adult male is distinguished by its bright grass-green upper parts, yellow underparts and orange belly patch. The adult female and juvenile are duller green in colour. All birds have a prominent two-toned blue frontal band and blue outer wing feathers.

Gang-gang cockatoo

The gang-gang cockatoo is found in the cooler and wetter forests and woodlands of Australia, particularly alpine bushland. Mostly mild grey in colour with some lighter scalloping, the male has a red head and crest, while the female has a small fluffy grey crest. It ranges throughout south-eastern Australia. The gang-gang cockatoo is the faunal emblem of the Australian Capital Territory. It is easily identified by its distinctive call, which is described as resembling a creaky gate, or the sound of a cork being pulled from a wine bottle.

Rainbow lorikeet

The rainbow lorikeet is a species of parrot found in Australia. It is common along the eastern seaboard, from northern Queensland to South Australia. Its habitat is rainforest, coastal bush and woodland areas. Several taxa traditionally listed as subspecies of the rainbow lorikeet are now treated as separate species, 6 species have now been identified.

Red-tailed black cockatoo Large black cockatoo native to Australia

The red-tailed black cockatoo also known as Banksian- or Banks' black cockatoo, is a large black cockatoo native to Australia. Adult males have a characteristic pair of bright red panels on the tail that gives the species its name. It is more common in the drier parts of the continent. Five subspecies are recognised, differing chiefly in beak size. Although the more northerly subspecies are widespread, the two southern subspecies, the forest red-tailed black cockatoo and the south-eastern red-tailed black cockatoo are under threat.

Black falcon Falcon species

The black falcon is a medium-large falcon that is endemic to Australia. It can be found in all mainland states and territories and yet is regarded as Australia's most under-studied falcon.

Carnabys black cockatoo A large bird endemic to southwest Australia

Carnaby's black cockatoo, also known as the short-billed black cockatoo, is a large black cockatoo endemic to southwest Australia. It was described in 1948 by naturalist Ivan Carnaby. Measuring 53–58 cm (21–23 in) in length, it has a short crest on the top of its head. Its plumage is mostly greyish black, and it has prominent white cheek patches and a white tail band. The body feathers are edged with white giving a scalloped appearance. Adult males have a dark grey beak and pink eye-rings. Adult females have a bone-coloured beak, grey eye-rings and ear patches that are paler than those of the males.

Western corella

The western corella also known as the western long-billed corella, is a species of white cockatoo endemic to south-western Australia.

Turquoise parrot Species of bird

The turquoise parrot is a species of parrot in the genus Neophema native to Eastern Australia, from southeastern Queensland, through New South Wales and into North-Eastern Victoria. It was described by George Shaw in 1792. A small lightly built parrot at around 20 cm (8 in) long and 40 g in weight, it exhibits sexual dimorphism. The male is predominantly green with more yellowish underparts and a bright turquoise blue face. Its wings are predominantly blue with red shoulders. The female is generally duller and paler, with a pale green breast and yellow belly, and lacks the red wing patch.

Corella (bird) Subgenus of birds

Licmetis is a subgenus of the white cockatoos. They are collectively known as corellas in Australia. Three of the six species are primarily – or only – found in Australia, while the Philippines, Indonesia, and the Solomons each have an endemic species. They are relatively small cockatoos and – unlike the members of the subgenus Cacatua – all have pale bills. While most show yellow-tinged underwings and some red to the face, none has conspicuously coloured crests.

Brown treecreeper

The brown treecreeper is the largest Australasian treecreeper. The bird, endemic to eastern Australia, has a broad distribution, occupying areas from Cape York, Queensland, throughout New South Wales and Victoria to Port Augusta and the Flinders Ranges, South Australia. Prevalent nowadays between 16˚S and 38˚S, the population has contracted from the edges of its pre-European range, declining in Adelaide and Cape York. Found in a diverse range of habitats varying from coastal forests to mallee shrub-lands, the brown treecreeper often occupies eucalypt-dominated woodland habitats up to 1,000 metres (3,300 ft), avoiding areas with a dense shrubby understorey.

Butler's corella is a medium-sized white cockatoo endemic to Western Australia. It is one of two subspecies of the western corella.

References

  1. Schodde, R.; & Mason, I.J. (1997). Zoological Catalogue of Australia: Aves. Columbidae to Coraciidae. CSIRO Publishing: Melbourne. ISBN   978-0-643-06037-1. p.93.
  2. 1 2 3 4 5 6 7 8 9 10 11 Anon. (2007). Muir’s Corella. (Fauna Note No.4). Department of Environment and Conservation, Western Australia.
  3. May (2012). Cockatoo, contentious moth back from brink. Herald Sun
  4. 1 2 3 Australian Government, Department of the Environment, Water, Heritage and the Arts - Species Profile and Threats Database: Cacatua pastinator pastinator.
  5. 1 2 Garnett, Stephen T.; & Crowley, Gabriel M. (2000). The Action Plan for Australian Birds 2000. Environment Australia: Canberra. ISBN   0-642-54683-5 "Archived copy" (PDF). Archived from the original (PDF) on 2009-03-04. Retrieved 2009-02-28.CS1 maint: archived copy as title (link)
  6. 1 2 Muir’s Corella: conserving a threatened species. Australian Government and South West Catchments Council.