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The Rufous Hummingbird (Selasphorus rufus) is a small hummingbird, about 8 cm long (3 inches) with a long, straight and very slender bill. The female is slightly larger than the male. They feed on nectar from flowers using a long extendible tongue or catch insects on the wing. These birds require frequent feeding while active during the day and become torpid at night to conserve energy. Because of their small size, they are vulnerable to insect-eating birds and animals.