The Nimba otter shrew has a fleshy nose, rounded head, compact body, and long tail. Long, gray or dark brown fur usually hides the eyes and most of the ears. It is about 15 cm (6") long and weighs up to 125 g (4 oz).
It shrew requires moist forest or forest-savanna-cultivation mosaics. It occurs in swampy areas and in small rivers and upland forest streams. It is an opportunistic feeder, taking a wide variety of invertebrates, as well as some fish and vegetable matter. Crustacea are the main prey, including crabs of up to 5 - 7 cm (2 - 3") across the carapace. It is thought to locate most of its food (much of it underwater) by touch, using the stiff whiskers in its flattened muzzle. It catches prey on short dives or along river banks, and eats them on land. A short nesting burrow is dug in soft soil. The Nimba otter shrew is nocturnal and semiaquatic. It is solitary.