Order Macrochires: GOATSUCKERS, SWIFTS, AND HUMMING-BIRDS Family Caprimulgidae: NIGHTHAWKS, WHIPPOORWILLS, ETC. 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.