Laughing owl - WikiHQ

The laughing owl (Ninox albifacies), also known as whēkau, the laughing jackass, or the white-faced owl, is an extinct species of owl that was endemic to New Zealand. Plentiful when European settlers arrived in New Zealand, its scientific description was published in 1845, but it was largely or completely extinct by 1914. The species was traditionally considered to belong to the monotypic genus Sceloglaux Kaup, 1848 ("scoundrel owl", probably because of the mischievous-sounding calls), although recent genetic studies indicate that it belongs with the boobook owls in the genus Ninox.

Taxonomy

thumb|upright|N. a. rufifacies

The laughing owl was originally described as Athene albifacies by George Robert Gray in 1844, based on a specimen from Waikouaiti, South Island. The type specimen is held at the British Museum (Reg. no. 1845.1.13.5).

The species was later transferred by Johann Jakob Kaup to other genera, first to the monotypic genus Sceloglaux (as S. albifacies) in 1848 and later to Ieraglaux (as I. albifacies) in 1852. Recent genetic studies now include it with the boobook owls in the genus Ninox, as N. albifacies.

Two subspecies of laughing owl have been described. In the North Island, specimens of the smaller subspecies N. a. rufifacies were allegedly collected from the forest districts of Mount Taranaki (1856) and the Wairarapa (1868); the unclear history of the latter and the eventual disappearance of both led to suspicions that the bird may not have occurred in the North Island at all. This theory has been refuted, however, after ample subfossil bones of the species were found in the North Island. Sight records exist from Porirua and Te Karaka; according to Māori tradition, the species last occurred in Te Urewera.

In the South Island, the larger subspecies N. a. albifacies inhabited low rainfall districts, including Nelson, Canterbury, and Otago. They were also found in the central mountains and possibly Fiordland. Specimens of N. a. albifacies were collected from Stewart Island / Rakiura in or around 1881.

Scientific specimens

thumb|Ninox albifacies egg specimen held at [[Te Papa]]There are 57 body and 17 egg specimens in public collections. Of these, either the specimen at NHMW (no. 50.809) or one at the Universidad de Concepción is the likely type of N. a. rufifacies.

Phylogeny

thumb|Laughing owls and moreporks in a taxidermy exhibition, Burton Brothers photographic studio, 1889

A 2016 study of the laughing owl's mitogenome concluded that the species does not belong to the monotypic genus Sceloglaux as previously thought, but instead belong to the genus Ninox.

Ecology and behaviour

upright|thumb|N. a. albifacies by [[John Gerrard Keulemans, drawn after living specimens owned by Walter Rothschild]]

Laughing owls generally occupied rocky, low-rainfall areas and also were found in forest districts in the North Island. Their diet was diverse, encompassing a wide range of prey items, from beetles and wētā up to birds and geckos of more than 250 g, and later on rats and mice. Laughing owls were apparently ground feeders, chasing prey on foot in preference to hunting on the wing. Knowledge of their diet, and how that diet

changed over time, is preserved in fossil and subfossil deposits of their pellets. These pellets have been a great help to the palaeobiological concentrations of otherwise poorly preserved small bones: "Twenty-eight species of bird, a tuatara, three frogs, at least four geckos, a skink, two bats, and two fish contribute to the species diversity" found in a Gouland Downs roosting site's pellets.

The owls' diet generally reflected the communities of small animals in the area, taking prions (small seabirds) where they lived near colonies, Coenocorypha snipe, kākāriki and even large earthworms. Once Pacific rats were introduced to New Zealand and began to reduce the number of native prey items, the laughing owl was able to switch to eating them, instead. They were still relatively common when European settlers arrived.

Being quite large, they were also able to deal with the introduced European rats that had caused the extinction of so much of their prey; however, the stoats introduced to control feral rabbits and feral cats were too much for the species.

Individuals of a bird louse of the genus Strigiphilus were found to parasitize laughing owls.

Reproduction

Breeding began in September or October. The nests were lined with dried grass and were on bare ground, in rocky ledges or fissures, or under boulders. Two white, roundish eggs were laid, measuring . Incubation took 25 days, with the male feeding the female on the nest.

Extinction

By 1880, the species was becoming rare. Only a few specimens were collected due to its location. Soon, the last recorded specimen was found dead at Bluecliffs Station in Canterbury, New Zealand on July 5, 1914. Unconfirmed reports have been made since then; the last (unconfirmed) North Island records were in 1925 and 1926, at the Wairaumoana branch of Lake Waikaremoana. There are reports of a laughing owl in the Pakahi near Ōpōtiki in the 1940s. An unidentified bird was heard flying overhead and giving "a most unusual weird cry which might almost be described as maniacal" at Saddle Hill, Fiordland, in February 1956, and laughing owl egg fragments were apparently found in Canterbury in 1960.

Extinction was caused by persecution (mainly for specimens), land use changes, and the introduction of predators such as cats and stoats. Until the late 20th century the species' disappearance was generally accepted to be due to competition by introduced predators for the kiore, or Pacific rat, a favourite prey of the laughing owl (an idea originally advanced by Walter Buller). However, since the kiore is itself an introduced animal, the laughing owl originally preyed on small birds, reptiles, and bats, and later probably used introduced mice, as well. Direct predation on this unwary and gentle-natured bird seems much more likely to have caused the species' extinction.

Specimen gallery

File:Naturalis_Biodiversity_Center_-_RMNH.AVES.110070_-_Sceloglaux_albifacies_albifacies_(Gray,_1844)_-_Laughing_Owl_-_specimen_-_lateral_view.jpeg

File:Naturalis_Biodiversity_Center_-_RMNH.AVES.110069_-_Sceloglaux_albifacies_albifacies_(Gray,_1844)_-_Laughing_Owl_-_specimen_-_lateral_view.jpeg

File:OR001778_Ninox_albifacies_albifacies_Te_Papa_630296_263370.jpg

File:OR010143_Ninox_albifacies_cf_albifacies_Te_Papa_630299_151892.jpg

File:OR030061_Ninox_albifacies_Te_Papa_1509640_375584.jpg

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Illustration gallery

File:Keulemans,_John_Gerrard,_1842-1912_-Sceloglaux_albifacies._J._G._Keulemans_del._Mintern_Bros_Imp._(London,_1876)_(21421090028).jpg

File:Keulemans,_John_Gerrard_1842-1912_-Morepork,_Spiloglaux_novae-zealandiae;_Laughing_owl,_Sceloglaux_novae-zelandiae._(One-half_natural_size)._-_J._G._Keulemans_delt._and_lith._(Plate_XX._1888)._(21289771031).jpg

File:The_zoology_of_the_voyage_of_the_H.M.S._Erebus_and_Terror_(6257851283).jpg

File:Bird_illustration_by_Elizabeth_Gould_for_Birds_of_Australia,_digitally_enhanced_from_rawpixel%27s_own_facsimile_book602.jpg

File:Morepork_(Ruru)_and_Laughing_owl_(Whekau).jpg