Malleefowl

Malleefowl
In Ongerup, Western Australia
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Galliformes
Family: Megapodiidae
Genus: Leipoa
Species: L. ocellata
Binomial name
Leipoa ocellata
Gould, 1840

The malleefowl (Leipoa ocellata) is a stocky ground-dwelling Australian bird about the size of a domestic chicken (to which it is distantly related). They are notable for the large nesting mounds constructed by the males and lack of parental care after the chicks hatch. It is the only living representative of the genus Leipoa, though the extinct giant malleefowl was a close relative.

Behaviour

Malleefowl camouflaged

Malleefowl are shy, wary, solitary birds that usually fly only to escape danger or reach a tree to roost in. Although very active, they are seldom seen as they freeze if disturbed, relying on their intricately patterned plumage to render them invisible, or else fade silently and rapidly into the undergrowth (flying away only if surprised or chased). They have many tactics to run away from predators.

Breeding

Pairs occupy a territory but usually roost and feed apart: their social behavior is sufficient to allow regular mating during the season and little else.

In winter, the male selects an area of ground, usually a small open space between the stunted trees of the mallee, and scrapes a depression about 3 m (9.8 ft) across and just under 1 m (3.3 ft) deep in the sandy soil by raking backwards with his feet. In late winter and early spring, he begins to collect organic material to fill it with, scraping sticks, leaves and bark into wind-rows for up to 50 m (160 ft) around the hole, and building it into a nest-mound, which usually rises to about 0.6 m (2.0 ft) above ground level. The amount of litter in the mound varies, it may be almost entirely organic material, mostly sand, or anywhere in between.

After rain, he turns and mixes the material to encourage decay and, if conditions allow, digs an egg chamber in August (the last month of the southern winter). The female sometimes assists with the excavation of the egg chamber, and the timing varies with temperature and rainfall. The female usually lays between September and February, provided there has been enough rain to start organic decay of the litter. The male continues to maintain the nest-mound, gradually adding more soil to the mix as the summer approaches (presumably to regulate the temperature).

Malleefowl mound

Males usually build their first mound (or take over an existing one) in their fourth year, but tend not to achieve as impressive a structure as older birds. They are thought to mate for life, and although the male stays nearby to defend the nest for nine months of the year, they can wander at other times, not always returning to the same territory afterwards.

The female lays a clutch of anywhere from two or three to over 30 large, thin-shelled eggs, mostly about 15; usually about a week apart. Each egg weighs about 10% of the female's body weight, and over a season it is common for her to lay 250% of her own weight. Clutch size varies greatly between birds and with rainfall. Incubation time depends on temperature and can be anywhere between about 50 and almost 100 days.

Hatchlings use their strong feet to break out of the egg, then lie on their backs and scratch their way to the surface, struggling hard for five or ten minutes to gain 3 to 15 cm (1 to 6 in) at a time, and then resting for an hour or so before starting again. Reaching the surface takes between 2 and 15 hours. Chicks pop out of the nesting material with little or no warning, with eyes and beaks tightly closed, then immediately take a deep breath and open their eyes, before freezing motionless for as long as 20 minutes.

Cross section of a malleefowl mound, showing layer of sand (up to 1 m thick) used for insulation; egg chamber; and layer of rotting compost. The egg chamber is kept at a constant 33°C by opening and closing air vents in the insulation layer, while heat comes from the compost below.

The chick then quickly emerges from out of the hole and rolls or staggers to the base of the mound, disappearing into the scrub within moments. Within an hour it will be able to run reasonably well; it can flutter for a short distance and run very fast within two hours, and despite not having yet grown tail feathers, it can fly strongly within a day.

Chicks have no contact with adults or other chicks: they tend to hatch one at a time and birds of any age ignore one another except for mating or territorial disputes.

Distribution and habitat

It occupies semi-arid mallee scrub on the fringes of the relatively fertile areas of southern Australia, where it is now reduced to three separate populations: the Murray-Murrumbidgee basin, west of Spencer Gulf along the fringes of the Simpson Desert, and the semi-arid fringe of Western Australia's fertile south-west corner.

Important Bird Areas

Several Important Bird Areas across southern mainland Australia have been identified by BirdLife International as being significant for malleefowl conservation:[2]

New South Wales

South Australia

Victoria

Western Australia

Conservation status

Across its range, the malleefowl is considered to be threatened. Predation from the introduced red fox is a factor, but the critical issues are changed fire regimes and the ongoing destruction and fragmentation of habitat. Like the southern hairy-nose wombat it is particularly vulnerable to the increasing frequency and severity of drought that has resulted from climate change. Before the arrival of Europeans, the malleefowl was found over huge swathes of Australia.[3]

International

The malleefowl is classified as vulnerable on the International Union for Conservation of Nature (IUCN) Red List.[1]

Australia

Fossils of Leipoa gallinacea, the extinct giant malleefowl of Australia

Malleefowl are listed as vulnerable on the Australian Environment Protection and Biodiversity Conservation Act 1999. Its conservation status has varied over time, and also varies from state to state within Australia. For example:

Yongergnow Australian Malleefowl Centre

The Yongergnow Australian Malleefowl Centre is located at Ongerup, Western Australia, on the road between Albany and Esperance. The centre opened in February 2007 and is intended to provide a focal point for education about the malleefowl and the conservation of the species. There is a permanent exhibition and a large aviary containing a pair of malleefowl. The centre collects reported sightings of the malleefowl.[9]

References

  1. 1 2 BirdLife International (2012). "Leipoa ocellata". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ↑ "Malleefowl". Important Bird Areas. BirdLife International. 2012. Retrieved 2012-10-27.
  3. ↑ Piper, Ross (2007), Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals, Greenwood Press.
  4. ↑ List of threatened taxa on FFG Act, Department of Sustainability and Environment, Victoria
  5. ↑ List of Action Statements, Department of Sustainability and Environment, Victoria
  6. ↑ Victorian Department of Sustainability and Environment (2007). Advisory List of Threatened Vertebrate Fauna in Victoria - 2007. East Melbourne, Victoria: Department of Sustainability and Environment. p. 15. ISBN 978-1-74208-039-0.
  7. ↑ List of threatened species, Department for Environment and Heritage, South Australia
  8. ↑ Mallefowl Description, Department of Environment and Conservation, New South Wales
  9. ↑ Yongergnow Australian Malleefowl Centre - Home Page

External links

Wikimedia Commons has media related to Leipoa ocellata.

Further reading

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