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fossa fos·sa (fŏs'ə)
n. pl. fos·sae (fŏs'ē')
A small longitudinal cavity or depression, as in a bone.
largest carnivore native to Madagascar, a catlike forest dweller of the civet family, Viverridae. The fossa grows to a length of about 1.5 metres (5 feet), including a tail about 66 centimetres (26 inches) long, and has short legs and sharp, retractile claws. The fur is close, dense, and grayish to reddish brown. Generally most active at night, the fossa is both terrestrial and arboreal. It usually hunts alone and commonly feeds on birds and lemurs but also preys on livestock. Many legends centre on the fossa; some, such as reports of its savagery, are probably much exaggerated.