GREEN, GREENISH GRAY, OLIVE, AND YELLOWISH OLIVE BIRDS
| Tree Swallow | Warbling Vireo |
| Ruby-throated Humming-bird | Ovenbird |
| Golden-crowned Kinglet | Worm-eating Warbler |
| Ruby-crowned Kinglet | Acadian Flycatcher |
| Solitary Vireo | Yellow-bellied Flycatcher |
| Red-eyed Vireo | Black-throated Green Warbler |
| White-eyed Vireo |
Look also among the Olive-brown Birds, especially for the Cuckoos, Alice's and the Olive-backed Thrushes; and look in the yellow group, many of whose birds are olive also. See also females of the Red Crossbill, Orchard Oriole, Scarlet Tanager, Summer Tanager.
Tree Swallow
(Tacbycineta bicolor) Swallow family
Called also: WHITE-BELLIED SWALLOW
(Illustration facing p. [171])
Length—5 to 6 inches. A little shorter than the English sparrow, but apparently much larger because of its wide wing-spread.
Male—Lustrous dark steel-green above; darker and shading into black on wings and tail, which is forked. Under parts soft white.