|
The Canary Islands oystercatcher, Canarian oystercatcher, or Canarian black oystercatcher (''Haematopus meadewaldoi''),〔 Etymology: ''Haematopus'', Latinized Ancient Greek for "bloody-footed", from ''(h)aimato-'' (αίματό-), '"blood-" + ''-p(o)us'' (πουϛ), "foot". ''meadewaldoi'', dedicated to Edmund Meade-Waldo. The specific name was formerly usually written ''meade-waldoi''.〕 was a shorebird endemic to Fuerteventura, Lanzarote, and their offshore islets (Islote de Lobos and the Chinijo Archipelago) in the Canary Islands, Spain. Hockey (1982) showed that the Canary Islands oystercatcher was a full species distinct from the African oystercatcher ''Haematopus moquini'', of which it was formerly considered a subspecies; these two were occasionally lumped as subspecies of the Eurasian oystercatcher. Though this bird was long known to naturalists, it was considered a mere local population of the African black oystercatcher until 1913 (Bannerman 1913). ==Description== The Canary Islands oystercatcher was of similar size as its relatives, the African and Eurasian oystercatchers, or about 40–45 cm (around 16.5 in); comparing with the non-migratory African species, it probably weighed between 600-800 grams in life, with females being slightly heavier. Its bill was some 70-80mm long in males and markedly longer (around 80mm) in females; the tarsus measured around 50 mm, and the wings were around 250-265mm long, with males possibly at the upper range of that size (Bannerman 1963). Its appearance was extremely similar to the African species, to the extent that even hand-held specimens can hardly be told apart except by direct comparison or measurements. Its bill was longer and its wings were shorter than in the African species, which is not known to occur north of Lobito, Angola however, at least in modern times.〔 But see Bolle (1857) who records the South African birds occurring as far north as Gabon.〕 ''H. meadewaldoi'' had a glossy black coloration overall save for the whitish underwing bases of the primary remiges' inner webs, but this may have not been present in worn plumage which also was duller (Bannerman 1963). Its bill, laterally compressed and with a blunt, lighter tip, and a narrow naked ring around the red eye were reddish orange, and the legs and feet were dark pink with ivory-colored nails. As usual in oystercatchers, it had no hallux and the second and third toes were connected by a small web (Álamo Tavío 1975). The sexes did not differ in color; juvenile birds are unknown but probably had duller bare parts and some greyish-buff fringes to the feathers. The coloration of downy young is likewise unknown; these are generally brownish-grey above with dark striping to provide camouflage against predators such as gulls (Hockey 1996); considering the dark lava rock habitat of this species, they were probably fairly dark overall and had a dusky belly. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canary Islands oystercatcher」の詳細全文を読む スポンサード リンク
|