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94 FORM AND HABIT: THE WING. 
high, whistling sound. In other cases the shafts of the 
wing-feathers may be much enlarged and horny, when 
the bird makes a sin- 
gular snapping sound 
in flight. 
If you recall the 
supplicating manner of 
~~~ FY a young bird as with 
Fie. 9.—Wing of Woodcock, showing three 5 
outer attenuate feathers. (%/, natural gently fluttering wings 
pez 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 will testify, and from this 
Fia. 10.—Jacana, showing spur on wing (natural size) and elongated toes (1/, 
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 
