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Indridae (formerly Indriidae; indri, sifaka; order Primates, suborder Strepsirrhini) A family of primitive primates that includes the largest of the living lemurs (up to 1 m long). Its members are distinguished from other lemurs by the absence of the lower canine and by having one upper and one lower premolar tooth. The tail is short in some species, and the ears may be concealed beneath long hair on the sides of the head. They are fully arboreal, although they visit the ground, and are exclusively vegetarian. There are six species (one discovered in 1988) in three genera: Indri (indri), Propithecus (sifaka), and Avahi (woolly indri). They are all confined to Madagascar.

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