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. ("Characterisics (Lutrogale perspicillata)", 2002; Chanin, 1985; Nowak M, 1991; "Species Profile: India Smooth-Coated Otter", 2002)
Smooth-coated otters form strong monogamous pairs. Although males are larger, it is females that dominate the pair. (Chanin, 1985)
No conclusive studies have been made on reproductive timing in smooth-coated otters. Where otters are dependent on monsoons for precipitation, they are most likely to breed between August and December. In the Delhi Zoo, all matings occurred in the month of August. The gestation period is 61-65 days. Smooth-coated otters give birth to and raise their young in a burrow or shelter near water, which they excavate, or they assume an abandoned one. The cubs disperse at about 1 year of age. Sexual maturity is reached at two years. (Chanin, 1985; Mason and Macdonald, 1986)
Two to five cubs are born in a litter, blind and helpless. At thirty days, the cub's eyes open, and by sixty days, they can swim. The young are weaned at about 130 days. Unlike other otters, smooth-coated otters form small family groups consisting of a mated pair with up to 4 offspring from previous seasons. The male is allowed to join the group after the cubs are weaned, and he helps provide the cubs with food. (Chanin, 1985; Mason and Macdonald, 1986)
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; "Species Profile: India Smooth-Coated Otter", 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. (Nowak M, 1991; Kruuk, 1995)
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. ("Characterisics (Lutrogale perspicillata)", 2002)
Smooth-coated otters impact aquatic vertebrate and invertebrate communities via predation. (Hussain and Choudhury, 1997; "Characterisics (Lutrogale perspicillata)", 2002)
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 do not negatively affect humans.
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)
Timothy White (author), University of Wisconsin-Stevens Point, Chris Yahnke (editor), University of Wisconsin-Stevens Point.
living in the northern part of the Old World. In otherwords, Europe and Asia and northern Africa.
uses sound to communicate
young are born in a relatively underdeveloped state; they are unable to feed or care for themselves or locomote independently for a period of time after birth/hatching. In birds, naked and helpless after hatching.
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
an animal that mainly eats meat
uses smells or other chemicals to communicate
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
Referring to a burrowing life-style or behavior, specialized for digging or burrowing.
mainly lives in water that is not salty.
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
Having one mate at a time.
having the capacity to move from one place to another.
specialized for swimming
found in the oriental region of the world. In other words, India and southeast Asia.
an animal that mainly eats fish
Referring to something living or located adjacent to a waterbody (usually, but not always, a river or stream).
communicates by producing scents from special gland(s) and placing them on a surface whether others can smell or taste them
breeding is confined to a particular season
remains in the same area
reproduction that includes combining the genetic contribution of two individuals, a male and a female
associates with others of its species; forms social groups.
a wetland area that may be permanently or intermittently covered in water, often dominated by woody vegetation.
uses touch to communicate
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
defends an area within the home range, occupied by a single animals or group of animals of the same species and held through overt defense, display, or advertisement
The term is used in the 1994 IUCN Red List of Threatened Animals to refer collectively to species categorized as Endangered (E), Vulnerable (V), Rare (R), Indeterminate (I), or Insufficiently Known (K) and in the 1996 IUCN Red List of Threatened Animals to refer collectively to species categorized as Critically Endangered (CR), Endangered (EN), or Vulnerable (VU).
uses sight to communicate
reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.
Amblonyx Otter Site. 2002. "Characterisics (Lutrogale perspicillata)" (On-line ). Amblonyx Otter Site. Accessed 11/27/02 at http://www.amblonyx.com/otter/perspicillata/otter_char.htm.
Otternet. 2002. "Species Profile: India Smooth-Coated Otter" (On-line ). Otternet. Accessed 11/27/02 at http://otternet.com/species/asiaotter.htm.
Chanin, P. 1985. The Natural History of Otters. New York, New York: Facts on File Inc..
Hussain, S. No Date. "Status of Otter Consevation in India" (On-line ). Accessed 12/3/02 at http://www.wii.gov.in/envhome/envisdec99/p92-97.htm.
Hussain, S., B. Choudhury. 1997. Distribution and Status of the Smooth-Coated Otter Lutra perspicillata in National Chambal Sanctuary, India. Biological Conservation, 80: 199-206.
IUCN, 2002. "2002 IUCN Red List of Threatened Species" (On-line ). Accessed 11/29/02 at http://www.redlist.org/search/details.php?species=12427.
Kruuk, H. 1995. Wild Otters. New York, New York: Oxford University Press.
Mason, C., S. Macdonald. 1986. Otters Ecology and Conservation. New York, New York: Cambridge University Press.
Nowak M, R. 1991. Walker's Mammals of the World. Baltimore: John Hopkins University Press.