Lutrogale perspicillata
smooth-coated otter

Smooth-coated otters are a Palearctic and Oriental species. They are found throughout much of southern Asia, from India eastward. There is also an isolated population found in the marshes of Iraq. Evidence shows that the range and population of smooth-coated otters is shrinking due to loss of habitat and intensive trapping. (Chanin, 1985; Hussain and Choudhury, 1997)

Smooth-coated otters are mostly found in lowlands, coastal mangrove forests, peat swamp forests, freshwater wetlands, large forested rivers, lakes, and rice paddies. Although adapted for water, smooth-coated otters are equally comfortable on land and can travel long distances overland in search of suitable habitat. They shelter in shallow burrows and piles of rocks or driftwood. Some build permanent burrows near water with an underwater entrance and a tunnel that leads to a chamber above the high-water line, much like American beaver. In Malaysia smooth-coated otters are more abundant in mangrove forests than in river systems. (Chanin, 1985; Mason and Macdonald, 1986)

Smooth-coated otters are the largest otters in southeast Asia. They weigh from 7-11 kg as adults and can be up to 1.3 m long. Their fur is shorter and smoother than other otters, and appears velvety and shining. They have short tightly packed under fur and longer water repellant guard hairs. The under fur measures 6-8mm, the guard hairs are 12-14 mm long. The fur is light to dark brown dorsally, and light brown to almost gray ventrally. Smooth-coated otters are distinguished from other otters by their rounder heads, prominent naked noses, and flattened tails. Their noses resemble an upside down v, or a distorted diamond. Like other otters, they have webbed feet and strong dexterous paws that are armed with sharp claws. (Amblonyx Otter Site, 2002; Chanin, 1985; Nowak M, 1991; Otternet, 2002)

The oldest known smooth-coated otter in captivity died at 20 years and five months. The typical lifespan in the wild is between 4 and 10 years, although no conclusive studies have been made. It is suggested that the mortality rate of smooth-coated otters is correlated with the abundance of fish. Smooth-coated otter populations follow fish populations in the Tarai areas of the upper Gangetic plains in India and Nepal. Following the monsoon season, smooth-coated otters move into flooded swamp areas to take advantage of fish population booms. The otters breed there and when the swamps shrink and the fish return to the permanent rivers so do the otters. (Hussain and Choudhury, 1997; Otternet, 2002)

Smooth-coated otters frequently hunt in groups, driving schools of fish together for easy capture. A group of otters has a feeding territory of 7-12 square km. (Kruuk, 1995; Mason and Macdonald, 1986)

Like other carnivores, smooth-coated otters use scent for inter and intra specific communication. They have a pair of scent glands at the base of the tail, which they use to mark vegetation, flat rocks, or shorelines near feeding areas. This marking behavior in otters is called sprainting. In areas where the smooth-coated otter, European otter, and small-clawed otter occur together, sprainting occurrs in different areas by each species. Sprainting sites in small-clawed otters are usually high on the bank on flat rocks. Sites for smooth-coated otters are more prominent than those of small-clawed otters. Sprainting sites of European otters are lower on the bank and less frequent than that of other otters. (Kruuk, 1995; Nowak M, 1991)

Smooth-coated otters also use visual cues, such as body postures, touch, and auditory cues in communicating with conspecifics.

Smooth-coated otters are omnivorous and will eat insects, earthworms, crustaceans, frogs, water rats, turtles, large birds, and fish. Fish make up 75 to 100% of the diet. Smooth-coated otters frequently hunt in groups, driving schools of fish together for easy capture. Fishermen in India and Bangladesh use this group hunting behavior to train them to herd fish into nets. A group of otters has a feeding territory of 7 to 12 square kilometers. A single adult consumes about 1 kg of food per day in captivity. (Kruuk, 1995; Mason and Macdonald, 1986)

Saltwater crocodiles and other crocodile species are the most likely predators of smooth-coated otters. Other potential predators are medium-sized cat species and large birds of prey (primarily on young otters). Smooth-coated otters are agile in the water and on land and use their sensitive whiskers to detect water disturbances. They are also social animals, with each animal in a group contributing to vigilance efforts. (Amblonyx Otter Site, 2002)

Smooth-coated otters impact aquatic vertebrate and invertebrate communities via predation. (Amblonyx Otter Site, 2002; Hussain and Choudhury, 1997)

Smooth-coated otters do not negatively affect humans.

Like other otters, smooth-coated otters are trapped for fur. Although not as luxurious as its North American cousin, the river otter, or the sea otter, the pelage of smooth-coated otters is used for garments, adornments, and other items. Trained smooth-coated otters are used by fisherman to herd fish into nets. (Hussain, No Date)

Smooth-coated otters are listed as vulnerable on the IUCN Red list. The population is threatened by loss of wetland habitats to large-scale hydroelectric projects, settlements and agriculture, poaching, and contamination of waterways by pesticides. Smooth-coated otters are protected in India under the Wildlife (Protection) Act, 1972, and are listed as endangered. They are also listed under schedule II, and listed in Appendix II of CITES. (Hussain, No Date; IUCN, 2002)