Orthonychidae

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Logrunners
Logrunner male lam jan08.jpg
Male Australian logrunner
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Orthonychidae
G.R. Gray, 1840
Genus: Orthonyx
Temminck, 1820
Type species
Orthonyx temminckii [1]
Ranzani, 1822
Species

Orthonychidae is a clade of passerine birds endemic to Australia and New Guinea. It encompasses the genus Orthonyx, including the logrunners and the chowdilla. Some authorities consider the Australian family Cinclosomatidae to be part of the Orthonychidae. The three species use their stiffened tails to brace themselves when feeding.

Contents

The Australian logrunner, Orthonyx temminckii, is from northeastern New South Wales and southeast Queensland, where it is very local in its distribution, and strictly terrestrial in its habits. The wings are barred with white, and the chin, throat and breast are in the male pure white, but of a bright reddish-orange in the female. The remiges are very short, rounded and much incurved, showing a bird of weak flight. The rectrices are very broad, the shafts stiff, and towards the tip divested of barbs. [2] The population which is found locally in New Guinea is now generally considered a separate species, the Papuan logrunner, Orthonyx novaeguineae.

The chowchilla, Orthonyx spaldingii, from north-east Queensland, is much larger than either species of logrunner, and has a jet-black plumage, the throat being white in the male and orange-rufous in the female. [2]

Taxonomy

The fossil record does not much help to determine the affiliations of the Orthonychidae. Three prehistoric species are known to science. The very large Orthonyx hypsilophus from Fossil Cave and an undescribed species found in Pyramids Cave which was a bit smaller than the Australian logrunner are probably of Late Pleistocene age. [3] Orthonyx kaldowinyeri [4] is known from Middle or Late Miocene deposits of Riversleigh; it is the oldest and smallest species known to date (Boles, 1993).

Species

ImageScientific nameCommon NameDistribution
Orthonyx novaeguineae Papuan logrunner New Guinea
Orthonyx temminckii - Kembla Heights.jpg Orthonyx temminckii Australian logrunner eastern Australia
Chowchilla Orthonyx spaldingii (male).JPG Orthonyx spaldingii Chowchilla Australia.

Description

Logrunners have a length ranging from 17 to 20 cm. On the other hand, the bulky chowchilla is significantly larger, measuring around 26 to 28 cm in length. [5] Chowchillas are characterized by their dark brown coloration on the upper parts of their bodies, a black head, and a blue-gray eye ring. Logrunners, on the other hand, display a patterned combination of olive, gray, and mottled black plumage. Male logrunners feature a white throat, while females have a rufous throat and upper breast.

Behaviour and ecology

Logrunners are semi-terrestrial birds of weak flight. They are strictly carnivorous, with insects and larvae being their chief food, while the larger chowchilla will also eat small lizards. [6] They find their food by digging in the soil, using their spiny tails as a support in the wet forest.

Social structure and breeding

Male chowchilla, Orthonyx spaldingii Chowchilla Orthonyx spaldingii (male).JPG
Male chowchilla, Orthonyx spaldingii

Logrunners have a somewhat unusual social structure. They are basically monogamous, [6] but male offspring are often retained on the natal territory for more than a year after fledging. [7] Despite this, only the female ever feeds the young; the much larger males stay primarily for the purpose of territorial defence and protecting the female from predation. Similar patterns of retention of young without alloparental care also occur in the speckled warbler, [8] the corvid genus Perisoreus [9] and the bustard genus Eupodotis .

Like the lyrebirds, logrunners typically breed in the southern winter from June to September, though this is often extended depending on weather conditions by a month or more. Both the chowchilla and the Papuan logrunner lay only one egg, while the Australian logrunner typically lays two though a few reports exist of clutches of one or even three. [6] The eggs are very unusual in their tubular shape, and are pure white in colour, while the incubation period is among the longest for any songbird. The young generally become independent of the female in two to two and a half weeks, which is an exceptionally short time for an insectivorous altricial Australian bird, [7] where parental dependence of forty to sixty days post-fledging is typical. [10] This is probably why, unlike in birds of drier habitats in Australia, alloparental care is superfluous for rearing young and may actually increase the risk of predation. The nests are domed and constructed entirely of sticks, and are located on the ground below a tree. They have special coverings to prevent the extremely heavy downpours typical of the eastern Australian coast from damaging the egg(s).

Males are described as performing dancing antics like those of the lyrebirds. [2]

Lifespan

In accordance with their nonseasonal, warm rainforest habitat, logrunners can be very long-lived. The chowchilla, the sole species with any banding data, has an average lifespan of around five years and has been known to live for seventeen. [11]

Distribution

The Australian logrunner lives in the humid lowland forest along the eastern coast of Australia. The Papuan logrunner is found in Indonesia and Papua New Guinea's tropical montane forests. Chowchillas live in the rain forests of northeastern Queensland.

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The Australian logrunner is a species of bird that is endemic to eastern Australia where it uses unique foraging techniques and adaptations to search for its food on the floors of temperate, subtropical, or tropical moist lowland forests in south-eastern Australia. Until 2002, it was widely considered to be conspecific with the New Guinea logrunner, but studies showed the two differ significantly, both genetically and vocally.

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Orthonyx kaldowinyeri is an extinct species of logrunner from the Late Oligocene to the Miocene of Australia. It was described by Walter Boles from fossil material found at the Last Minute Site of Riversleigh, in the Boodjamulla National Park of north-western Queensland. It was a relatively small logrunner. The specific epithet kaldowinyeri is an Aboriginal term for “old”, referring to the Miocene age of the species which is earlier than that of other members of the genus.

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Cinclosomatidae is a family of passerine birds native to Australia and New Guinea. It has a complicated taxonomic history and different authors vary in which birds they include in the family. It includes the quail-thrushes and jewel-babblers.

References

  1. "Orthonychidae". aviansystematics.org. The Trust for Avian Systematics. Retrieved 16 July 2023.
  2. 1 2 3 Newton 1911.
    • Boles, Walter E. (1993): A Logrunner Orthonyx (Passeriformes: Orthonychidae) from the Miocene of Riversleigh, North-western Queensland. Emu 93: 44–49. doi : 10.1071/MU9930044 (HTML abstract)
  3. Etymology: kaldowinyeri is the Yaralde (Ngarrindjeri) word for "a very long time ago"; this species is the oldest record of the family found to date. Like the bird, the language is nowadays extinct.
  4. Harris, Tim (2009). National Geographic Complete Birds of the World. Washington DC: National Geographic. p. 234. ISBN   978-1-4262-0403-6.
  5. 1 2 3 Higgins, P.J. and J.M. Peter; Handbook of Australian, New Zealand and Antarctic Birds, vol. 6: Pardalotes to Shrike-thrushes . ISBN   0-19-553762-9
  6. 1 2 Frith, C.B., Frith, D.W. & Jansen, A. 1997. "The nesting biology of the Chowchilla Orthonyx spaldingii (Orthonychidae)"; Emu 97, 18–30.
  7. Gardner, J. L., Magrath, R. & Kokko, H.; "Stepping stones of life: natal dispersal in the group-living but noncooperative speckled warbler"; Animal Behaviour, 66, 521–530.
  8. Komdeur, Jan and Ekman, Jan; "Adaptations and constraints in the evolution of delayed dispersal: implications for cooperation"
  9. Russell, Eleanor M.; "Avian Life Histories: Is Extended Parental Care the Southern Secret?" in Emu 100, 377–399.
  10. Australian Bird and Bat Banding Scheme; Chowchilla

Bibliography