| 词条 | Parasitic jaeger |
| 释义 |
| image = Parasitic Jaeger.jpg | status = LC | status_system = IUCN3.1 | status_ref = [1] | genus = Stercorarius | species = parasiticus | authority = (Linnaeus, 1758) | range_map = Stercorarius parasiticus map.svg | synonyms = Larus parasiticus {{small|Linnaeus, 1758}} }} The parasitic jaeger (Stercorarius parasiticus), also known as the Arctic skua, Arctic jaeger or parasitic skua, is a seabird in the skua family Stercorariidae. The word "jaeger" is derived from the German word Jäger, meaning "hunter".[2] The English "skua" comes from the Faroese name skúgvur {{IPA-fo|ˈskɪkvʊər|}} for the great skua, with the island of Skúvoy known for its colony of that bird. The general Faroese term for skuas is kjógvi {{IPA-fo|ˈtʃɛkvə|}}.[3] The genus name Stercorarius is Latin and means "of dung"; the food disgorged by other birds when pursued by skuas was once thought to be excrement. The specific parasiticus is from Latin and means "parasitic".[4] DescriptionIdentification is complicated by similarities to long-tailed jaeger and pomarine jaeger, and the existence of three colour morphs. Small for a skua, the Parasitic Jaeger measures {{convert|41|-|48|cm|in|abbr=on}} in length, {{convert|107|-|125|cm|in|abbr=on}} in wingspan and weighs {{convert|300|-|650|g|lb|abbr=on}}.[5] The tail streamer of the breeding adult accounts for about {{convert|7|cm|in|abbr=on}} of their length. Light-morph adults have a brown back, mainly white underparts and dark primary wing feathers with a white "flash". The head and neck are yellowish-white with a black cap and there is a pointed central tail projection. Dark-morph adults are dark brown, and intermediate-phase birds are dark with somewhat paler underparts, head and neck. All morphs have the white wing flash. Identification of juveniles is even more problematic, and it is difficult to separate parasitic jaegers from long-tailed jaegers. Parasitic jaegers are bulkier, shorter-winged, and less tern-like than long-tailed jaegers. They are usually warmer toned, with browner shades, rather than grey. However, they show the same wide range of plumage variation. The flight is more falcon-like. The typical call of these birds is a nasal mewing sound, repeated a few times in display. Their alarm call is a shorter sound. BehaviorBreedingThis species breeds in the north of Eurasia and North America, with significant populations as far south as northern Scotland. It nests on dry tundra, higher fells and islands, laying up to four olive-brown eggs. It is usually silent except for mewing and wailing notes while on the breeding grounds. Like other skuas, it will fly at the head of a human or fox approaching its nest. Although it cannot inflict serious damage, it is a frightening and painful experience. It is a migrant, wintering at sea in the tropics and southern oceans. In the British Isles, they breed in Shetland and Orkney, the Outer Hebrides, Sutherland, Caithness, and some islands in Argyll. FeedingThis bird will feed on rodents, small birds, and insects in the breeding season, but the majority of its diet (espeially in winter and on migration) is made up of food that it acquires by robbing other birds (primarily gulls and terns) of their catches in an act called kleptoparasitism. References1. ^{{IUCN|id=22694245 |title=Stercorarius parasiticus |assessor=BirdLife International |assessor-link=BirdLife International |version=2013.2 |year=2012 |accessdate=26 November 2013}} 2. ^{{Cite OED |Jaeger}} 3. ^{{Cite OED |Skua}} 4. ^{{cite book | last= Jobling | first= James A | year= 2010| title= The Helm Dictionary of Scientific Bird Names | publisher= Christopher Helm | location = London | isbn = 978-1-4081-2501-4 | pages=292, 365}} 5. ^{{cite web |url=http://www.arkive.org/parasitic-jaeger/stercorarius-parasiticus/#text=Facts |title=Parasitic jaeger |year=2011 |access-date=2011-10-20 |archive-url=https://web.archive.org/web/20111106153214/http://www.arkive.org/parasitic-jaeger/stercorarius-parasiticus/#text=Facts#text=Facts |archive-date=2011-11-06 |dead-url=yes |df= }} }} External links{{Commons category|Stercorarius parasiticus}}{{Wikispecies|Stercorarius parasiticus}}
9 : Skuas|Cosmopolitan birds|Birds of the Arctic|Holarctic birds|Birds of Scandinavia|Birds of Iceland|Birds of Europe|Birds of Southern Africa|Birds described in 1758 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。