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Megapodiidae
1024px-Alectura lathami - Centenary Lakes
Australian Brushturkey (Alectura lathami)
Scientific Classification
Kingdom Animalia
Phylum Chordata
Class Aves
Order Galliformes
Family Megapodiidae

Megapodiidae or megapodes, incubator birds and mound-builders, is a genus of stocky, medium-large chicken-like birds with small heads and large feet. Their name literally means "large foot" (Greek: mega = large, poda = foot), and is a reference to the heavy legs and feet typical of these terrestrial birds. All are browsers, all but the malleefowl occupy wooded habitats. Most are brown or black colored. Megapodes are superprecocial, hatching from their eggs in the most mature condition of any birds. They hatch with open eyes, bodily coordination and strength, full wing feathers and downy body feathers,and are able to run, pursue prey, and, in some species, fly on the same day they hatch.

Description

Megapodes are medium-sized to large terrestrial birds with large legs and feet with sharp claws. They range from 28 to 70 cm. The largest members of the clade are the species of Alectura and Talegalla. The smallest are the Micronesian megapode (Megapodius laperouse) and the Moluccan megapode (Eulipoa wallacei). They have small heads, short beaks, and rounded and large wings. Their flying abilities vary within the clade. They present the hallux at the same level of the other toes just like the species of the clade Cracidae. The other Galliformes have their halluces raised above the level of the front toes.

Distribution and Habitat

Megapodes are found in the broader Australasian region, including islands in the western Pacific, Australia, New Guinea, and the islands of Indonesia east of the Wallace Line, but also the Andaman and Nicobar Islands in the Bay of Bengal. The distribution of the family has contracted in the Pacific with the arrival of humans, and a number of island groups such as Fiji, Tonga, and New Caledonia have lost many or all of their species.

Behaviour and Ecology

Megapodes are mainly solitary birds that do not incubate their eggs with their body heat as other birds do, but bury them. Their eggs are unique in having a large yolk, making up 50-70% of the egg weight. They are best known for building massive nest-mounds of decaying vegetation, which the male attends, adding or removing litter to regulate the internal heat while the eggs hatch. However, some bury their eggs in other ways; there are burrow-nesters which use geothermal heat, and others which simply rely on the heat of the sun warming sand. Some species vary their incubation strategy depending on the local environment. Although the Australian brushturkey was thought to exhibit Temperature-dependent sex determination it was later proven false, it was speculated that this is common to all Megapodes, as they share nesting methods unique among birds. The non-social nature of their incubation raises questions as to how the hatchlings come to recognise other members of their species, which is due to imprinting in other members of the order Galliformes. Recent research suggests an instinctive visual recognition of specific movement patterns is made by the individual species of megapode.

Megapode chicks do not have an egg tooth; they use their powerful claws to break out of the egg, and then tunnel their way up to the surface of the mound, lying on their backs and scratching at the sand and vegetable matter. Similar to other superprecocial birds, they hatch fully feathered and active, already able to fly and live independently from their parents.

Genera

The more than 20 species are in 7 genera. Although the evolutionary relationships between the Megapodiidae are especially uncertain, the morphological groups are clear:

Scrubfowl group
 Genus: Macrocephalon
  Maleo (S. Müller, 1846) (Macrocephalon maleo)
 Genus: Eulipoa
  Moluccan Megapode (Gray, 1860) (Eulipoa wallacei)
 Genus: Megapodius
  Tongan Megapode (Gray, 1864) (Megapodius pritchardii)
  Micronesian Megapode (Gaimard, 1823) (Megapodius laperouse)
   Marianas Island Megapode (Gaimard, 1823) (Megapodius laperouse laperouse)
   Palau Island Megapode (Hartlaub, 1868) (Megapodius laperouse senex)
  Nicobar Megapode (Blyth, 1846) (Megapodius nicobariensis)
  Philippine Megapode (Dillwyn, 1853) (Megapodius cumingii)
  Sula Megapode (Schlegel, 1866) (Megapodius bernsteinii)
  Tanimbar Megapode (Sclater, 1883) (Megapodius tenimberensis)
  Dusky Megapode (Gaimard) (Megapodius freycinet)
   Forsten's Megapode (GR Gray, 1847) (Megapodius freycinet forstenii)
  Biak Megapode (A.B. Meyer, 1874) (Megapodius geelvinkianus)
  Melanesian Megapode (Hartlaub, 1867) (Megapodius eremita)
  Vanuatu Megapode (Tristram, 1879) (Megapodius layardi)
  New Guinea Megapode (Meyer, 1874) (Megapodius affinis)
  Orange-footed Megapode (Dumont, 1823) (Megapodius reinwardt)
  †Pile-builder Megapode (Balouet & Olson, 1989) (Megapodius molistructor)
  †Viti Levu Scrubfowl (Worthy, 2000) (Megapodius amissus)
  †Consumed Scrubfowl (Steadman, 1989) (Megapodius alimentum)
 Genus: Megavitiornis
  Noble Megapode (Worthy, 2000) (Megavitiornis altirostris)
Malleefowl group
 Genus: Leipoa
  Malleefowl (Gould, 1840) (Leipoa ocellata)
  †Giant Malleefowl (De Vis, 1888) (Leipoa gallinacea)
Brushturkey group
 Genus: Alectura
  Australian Brushturkey (Gray, 1831) (Alectura lathami)
 Genus: Aepypodius
  Wattled Brushturkey (Salvadori, 1877) (Aepypodius arfakianus)
  Waigeo Brushturkey (Oustalet, 1880) (Aepypodius bruijnii)
 Genus: Talegalla
  Red-billed Brushturkey (Lesson, 1828) (Talegalla cuvieri)
  Black-billed Brushturkey (Salvadori, 1877) (Talegalla fuscirostris)
  Collared Brushturky (Meyer, 1874) (Talegalla jobiensis)
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