飞羽
3.Adult winter Mongolian Gull: This bird has new primaries with white tips (Mongolian is the first of the three species to complete its primary moult).
4.one of the main flight feathers projecting along the outer edge of a bird's wing.
5.First warbler Yellow-browed, the dark bases to the secondaries and black-centred greater coverts leave few other options.
6.It is a very big generalization, and some species are exceptions, but generally first summer individuals can only be separated by retained juvenile remiges and rectrices or by moult limits in the greater coverts.
7.It also shows white crescents separating the grey from the black on the mid-primaries, apparently not shown by Ring-billed.
8.Unusual peacocks are the Argus pheasant, with eyelike spots on its secondary flight feathers, and the white peacock, thought to be a mutation of the common peafowl.
9.Live Chinese Bulbul (Pycnonotus sinensis), Japanese White-eye (Zosterops japonicus), Great Tit (Parus major) and Tris-trams Bunting (Emberiza tristrami ) were collected at Baiyushan, Guangzhou city in China from November 1999 to January 2000. The birds were killed and primary feathers, chest muscle and liver were extracted. Levels of mercury, arsenic and selenium were analyzed by using an atomic absorption spectrophotometer.
10.Mongolian Gull: pale upperside, clear contrast between black primaries and pale blue-grey upperwing, strikingly white head, typically two quite large mirrors on P10 and P9.
