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any of 11 species of slender, rather long-limbed monkeys found in African tropical forests. Mangabeys are fairly large quadrupedal monkeys with cheek pouches and deep depressions under the cheekbones. Species range in head and body length from about 40 to almost 90 cm (16-35 inches) and weigh up to about 11 kg (24 pounds) in males and 6 kg in females; the tail is about as long as the head and body. Mangabeys are highly social and generally quiet, and they feed on seeds, fruit, and leaves. Their large front teeth enable them to bite into fruit that is too tough-coated for other monkeys.