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 2-4 FORM AND HABIT: THE WING. high, whistling sound. In other eases the shafts of the wing-feathers may be much enlarged and horny, when the bird makes a sin- ular snapping sound If you recall the supplicating manner of a young bird as with Fig. 9. — Winsr of Woodcock, showing three ^ n .• - outer attenuate feathers. ('-/■! natural gently lluttenng WlUgS "'■ ^ it begs for food, you will recognize one of several ways in which the wings may express emotion. Birds also threaten with their wings, as any hen with chicks ^vill testify, and from this Fig. 10. — Jacana, showing spur on wing (natural size) and elongated toes ('/s natural size). gesture to the actual delivery of a blow is but a step. Swans, Pigeons, and Chickens can deal forcible blows with their wings. Screamers, Lapwings, and Jacanas