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Negros fruit dove
The Negros fruit dove (''Ptilinopus arcanus'') is a species of bird in the pigeon and dove family, Columbidae. It is endemic to the island of Negros in the Philippines. This fruit dove is known from a single female specimen collected from the slopes of Mount Kanlaon in the northern part of the island. While it was found at a high elevation, it is suspected that the species originally lived in the lowland dipterocarp forests and was driven to higher elevations by habitat destruction. While some have suggested that the specimen is either a runt or a hybrid instead of a valid species, this is not widely accepted. The female Negros fruit dove was a small fruit dove with vivid dark green plumage and an ashy-grey forehead. It had a distinctive ring of bare yellow skin around its eye, and yellow fringes to some of its feathers gave it the appearance of having a yellow wingbar when perched. The throat was white, while the undertail and vent were yellow.
The original specimen was shot along with a bird suspected to be its mate from a fruiting tree. Nothing else is known about its behavior. The species has not been definitively reported since its original discovery in 1953, and as several searches of Mount Kanlaon and the surrounding forests have not discovered any sign of the bird, many believe that it may be extinct. However, an unconfirmed report of the Negros Fruit Dove from southern Negros in 2002 and the discovery of many species formerly thought endemic to Negros on the nearby island of Panay have given some hope that the species may persist. As such, it is currently listed as Critically Endangered by the IUCN. Any surviving population would be very small, likely numbering fewer than 50 individuals, and would be threatened by habitat destruction and hunting.
==Taxonomy==
The Negros fruit dove was described in 1955 as ''Ptilinopus arcanus'' by Sidney Dillon Ripley and Dioscoro Rabor on the basis of a single female specimen collected by Rabor on May 1, 1953. This specimen, collected near Pula on the slopes of Mount Kanlaon in the Philippines, was shot along with a second bird, presumed to be its mate, which was lost in the undergrowth. The holotype is preserved as a skin by Yale University's Peabody Museum of Natural History.〔 The generic name ''Ptilinopus'' comes from the Ancient Greek words ''ptilon'' "feather," and ''pous'', "foot." The specific name ''arcanus'' comes from the Latin word ''arcānus'' "secret."
Some authors have suggested that the specimen was either a runt of either the yellow-breasted fruit dove or a ''Treron'' pigeon, or a hybrid instead of a unique species; however, these views are generally considered invalid due in part to the distinctiveness of the specimen, particularly in the bare skin around the eye, and no proper evidence has suggested that the Negros fruit dove is an invalid species.〔〔 It is uncertain where the dove should be placed within the genus ''Ptilinopus'' as the male's plumage, a key feature used in organizing the ''Ptilinopus'' doves, is unknown. It has been suggested that the Negros fruit dove is either most closely related to the black-naped fruit dove or represents an early colonization of the Philippines by the genus that has left no surviving close relatives.〔 It has no known subspecies and is also known as Ripley's fruit dove.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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