Goatsuckers are long winged birds, with small bills, but with an extraordinarily large mouth, the opening of which extends beneath and beyond the eyes. They are chiefly dusk or night fliers, their food consisting of insects which they catch on the wing. Their plumage is mottled black, brownish and white, resembling the ground upon which they lay their eggs.

Goatsuckers Swifts And Hummingbirds Order XVI Macr 805