怎么根据捡到的羽毛，找出是什么鸟掉下的？（二）

tips for identifying found feathers（2）

All of the large wing feathers, primaries and secondaries, curve back and down, and the outermost are strongly asymmetrical: The leading edge is narrower than the trailing edge, and the tip is angled. The inner wing feathers , secondaries, are also curved; the shaft is close to the center of the feather, and the tip is squarish.

The outer tail feathers, like the outer wing feathers, are asymmetrical with a narrow leading edge, and the shaft has a slight S-shaped curve. This shape changes gradually to the almost perfectly straight and symmetrical central tail feathers.

All of the body feathers are smaller, symmetrical, flexible, and rounded. They grow out from the body and curve back toward the tail. The size and length of the feathers varies greatly, from short and stiff feathers around the face and at the leading edge of the wing, to relatively long and flexible feathers on the flanks.

Using these simple guidelines of shape, you should be able to determine the placement of a feather, and then use color to narrow down the possible species., said  David Sibley, the author of The Sibley Guide to Birds.

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