Medium-sized, mottled brownish, gray, black, and white birds of heavy build. Short, thick head; gaping, large mouth; very small bill, with bristles at base. Take insect food on the wing. Feet small and weak; wings long and powerful. These birds rest lengthwise on their perch while sleeping through the brightest daylight hours, or on the ground, where they nest. Nighthawk. Whippoorwill.

Family Micropolidae: SWIFTS

Sooty, dusky birds seen on the wing, never resting except in chimneys of houses, or hollow trees, where they nest. Tips of tail feathers with sharp spines, used as props. They show their kinship with the goatsuckers in their nocturnal as well as diurnal habits, their small bills and large mouths for catching insects on the wing, and their weak feet. Gregarious, especially at the nesting season. Chimney Swift.

Family Trochilidae: HUMMING-BIRDS

Very small birds with green plumage (iridescent red or orange breast in males); long, needle-shaped bill for extracting insects and nectar from deep-cupped flowers, and exceedingly rapid, darting flight. Small feet. Ruby-throated Humming-bird.