parrot crossbill造句

• The parrot crossbill is a specialist feeder on the cones of Scots pine.
• Spring siskins or common crossbills, and parrot crossbills bred in 1984 and 1985.
• In the forests, capercaillie, black grouse, Scottish crossbill, parrot crossbill and crested tit are found.
• For example, the culmen of the parrot crossbill is strongly decurved, while that of the very similar red crossbill is more moderately curved.
• Until 2009, the parrot crossbill was an anomaly, in that it was on the committee's list of species, even though a breeding population existed in Scotland.
• Within its Eurasian range, this species is smaller-headed and smaller-billed than parrot crossbill and Scottish crossbill, so the main confusion species both there and in North America is common or red crossbill.
• In addition to parrot crossbill, four species, Cetti's warbler, little egret, long-tailed skua and Mediterranean gull, have become so common that they no longer qualify even as scarce migrants.
• Some large-billed, pine-feeding populations currently assigned to this species in the Mediterranean area may possibly be better referred to either parrot crossbill or to new species in their own right, but more research is needed.
• This species is difficult to separate from parrot crossbill and Scottish crossbill, both of which breed within its Eurasian range, as plumage distinctions from those two species are negligible, though the head and bill are smaller than in either of the other species.
• Preliminary investigations in Europe and Asia suggest an equal, if not greater, complexity, with several different call types identified; these call types being as different from each other as from the named species Scottish and parrot crossbills-suggesting either that they are valid species, or else that the Scottish and parrot may not be.
• These include Balearic crossbill " L . curvirostra balearica " and North African crossbill " L . curvirostra poliogyna ", feeding primarily on Aleppo pine ( " Pinus halepensis " ); Cyprus crossbill " L . curvirostra guillemardi ", feeding primarily on European black pine ( " Pinus nigra " ); and an as-yet unidentified crossbill with a parrot crossbill-size bill feeding primarily on Bosnian pine ( " Pinus heldreichii " ) in the Balkans.