black tipped _broadly_ with white; wings
show a _reddish-brown tinge in flight_; glides stealthily from tree to
tree and keeps concealed among the leaves; slowly droops and raises its
tail when perching; song, loud "kuk-kuk, kuk-kuk." *Black-billed Cuckoo.
*Mourning Dove.

104. CANADIAN WARBLER. 5-1/2 in.
(Wilsonia canadensis. 686.)

Bluish-lead color; yellow below with a necklace of black spots; no
wing-bars; noteworthy song. *Magnolia Warbler.

105. WILSON BLACK-CAP WARBLER. 4-3/4 in.
(Wilsonia pusilla. 685.)

Bright olive-green; yellow below; _black cap_; in low bushes. *Pine
Warbler. *Female Western Yellow-throat.

106. LINCOLN SPARROW. 5-3/4 in.
(Melospiza lincolni. 583.)

_Finely_ streaked with black and brown; white beneath, with *broad buff
band across the breast and down the sides; narrow streaks on throat,
upper breast and sides; dark stripe on each side of throat from corner of
mouth; very shy. *Song *and *Swamp Sparrows.

107. RUBY-THROATED HUMMINGBIRD. 3-1/4 in.
(Trochilus colubris. 428.)

Iridescent green and purple; male has ruby-red throat; frequents
flowering shrubs and plants; darts here and there and poises in mid air
with wings vibrating so rapidly that they make a humming noise; "squeaky
note."

108. NIGHTHAWK. 9-1/2 in.
(Chordeiles virginianus. 420.)

On the wing overhead after insects just before or at dusk; long, pointed
wings _showing a white patch_; flight resembles that of _Chimney Swift_;
sharp note, "skeep;" often nests on the flat roofs of city buildings.
*Whip-poor-will.

109. BLACK-BILLED CUCKOO. 12 in.
(Coccyzus erythropthalmus. 388.)

Bronzy olive-gray; white below; bill _entirely_ black; _only a little
white_ on tail; movements like those of _Yellow-billed Cuckoo_; song,
soft "coo-coo, coo-coo." *Yellow-billed Cuckoo. *Mourning Dove.

110. GRAY-CHEEKED THRUSH. 7-1/2 in.
(Hylocichla aliciae. 757.)

Uniform olive; below white, _very palely_ suffused with buff; cheeks
_gray tinged_; breast and sides of throat, spotted; usually silent in
Lincoln Park. *Olive-backed and *other Thrushes.

111. YELLOW-HEADED BLACKBIRD. 10-1/4 in.
(Xanthocepha