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The fossa is the largest carnivorous mammal on the island of Madagascar. They can reach nearly six feet in length, with half of that due to their long tails. They look like a cross between a cat, a dog, and a mongoose. Fossas have slender bodies, muscular limbs, and short, reddish-brown coats. They have small, cat-like heads, short, dog-like muzzles, and large, rounded ears.
Fossas are mainly solitary. With the exception of mothers with young and brief pairings during the breeding season, fossas are solitary animals. They patrol and defend territories as large as four square kilometers.
Fossas communicate largely through scent glands. Both males and females occupy territories that they scent mark with secretions from glands on their chests and under the base of their tails. Fossas mark rocks, trees, and the ground to communicate and keep track of each other. Their glands also release a pungent smell when the animal is irritated or frightened.
They are agile climbers. The fossa's long, slender tail provides balance as it moves through the trees, and its semiretractable claws and flexible ankles allow it to climb up and down trees head-first.
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