. Birds of the United States east of the Rocky Mountains, a manual for the identification of species in hand or in the bush;. Birds; Birds. 42 KEY AND DESCRIPTION For convenience of reference the pictures of bird parts are repeated in the Key. The map on p. 41 shows the portion of the United States covered by the birds in this book. KEY TO THE FAMILIES OF BIRDS * Swimming birds: legs rather short; three front toes either with full webbing,1 or with such membranes along their sides2 as to take the place of webbing. (All birds with the front toes webbed to about the nails will be found in this g
. Birds of the United States east of the Rocky Mountains, a manual for the identification of species in hand or in the bush;. Birds; Birds. 42 KEY AND DESCRIPTION For convenience of reference the pictures of bird parts are repeated in the Key. The map on p. 41 shows the portion of the United States covered by the birds in this book. KEY TO THE FAMILIES OF BIRDS * Swimming birds: legs rather short; three front toes either with full webbing,1 or with such membranes along their sides2 as to take the place of webbing. (All birds with the front toes webbed to about the nails will be found in this group, excepting one very long-legged bird with the tarsus 12 inches or more long. All the illustrations in this book, from p. 279 to p. 348, are of swimmers.) Key to the Families of Swimming Birds, p. 48. * Wading birds: legs in most cases much elongated; tibia always ex- serted, and in most cases more or less naked below (see p. 248); tail relatively short; few have the tail extending beyond the tip of the wings when closed ; toes frequently with more or less webbing at base,3 sometimes narrowly lobed along the sides. (Some species of these birds live habitually in dry localities, but their forms are very characteristic, and only a few ground birds, such as the meadow lark or quail, could possibly be placed in this group. All the illus- trations from p. 227 to p. 275 are of waders.) Key to the Families of Wading Birds, p. 46. * Birds fitted neither for swimming nor for wading. (A.) A. With only 2 toes in front, and in most species 2 behind ;4 eyes on the side of the head, as is usual with birds. (Q.) A. Eyes in a facial disk, and thus directed forward instead of side- wise ;5 outer toe can be used either before or behind — — Nail of middle toe smooth on the inner side XXVII. Horned Owls, etc. — Nail of middle toe saw-like on the inner side6 XXVIII. Barn Owl. A. With 3 toes permanently in front and 1 toe (rarely absent) be- hind ;7 eyes directed sideways. (The vultures, p
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
