This chapter details how the author saw nighthawks while bird-watching in Lake Perez in Stone Valley. Nighthawks and their relatives — whip-poor-wills, oilbirds, frogmouths, pauraques, and nightjars — are odd, secretive, mostly crepuscular or nocturnal birds. On the wing, a common nighthawk is acrobatic and incredibly sleek. In the hand, however, its wings seem too long, its body squat and strange. A nighthawk's tiny black beak hides an enormous mouth that resembles a bullfrog's when it opens. Because they eat and drink while flying, this oversized mouth is useful for trapping insects and skimming lake water. The ancient Greeks and Romans believed that these unusual birds used their huge mouths for another purpose: drinking milk from the teats of goats and sheep under the cover of night. According to the lore, a goat suckled by a nightjar met an unfortunate end — blindness and then death. Of course, the birds do not engage in this behavior, but the belief earned their family the name Caprimulgidae, or “goatsucker.”