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Head-body 57-70 cm; tail 35-40 cm.
An amphibious carnivore with elongated, sinuous and lithe body, short limbs, and a long tail. Its coat light brownish-grey to dusky brown; lighter on the underside, except the buff to cream chest. Tail thick at the base, tapering to a point; with flattened underside. Feet well-webbed, equipped with strong claws. There are numerous stiff whiskers around the snout and in tufts on the elbows.
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Chiang Rai (Nong Bong Khai); Mae Hong Son (Lum Nam Pai, Huai Nam
Dung); Tak (Thung Yai, Umphang); Kamphaeng Phet (Khlong Lan,
Khlong Wang Chao); Nakhon Sawan (Mae Wong); Kanchanaburi (Thung
Yai, Sri Nakarin); Uthai Thani (Huai Kha Kaeng).