Aonyx cinereus 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Carnivora Mustelidae

Scientific Name: Aonyx cinereus
Species Authority: (Illiger, 1815)
Common Name(s):
English Asian Small-clawed Otter, Small-clawed Otter, Oriental Small-clawed Otter
French Loutre cendrée
Spanish Nutria Cenicienta, Nutria Inerme Asiatica
Amblonyx cinereus (Illiger, 1815)
Aonyx cinerea (Illiger, 1815) [orth. error]
Lutra cinerea Illiger, 1815
Taxonomic Notes: The spelling of the species epithet in Aonyx cinerea (Illiger, 1815) was incorrect; the genus name 'Aonyx' is masculine  and hence the adjectival species name 'cinerea' should be changed to have a masculine ending. The species is now correctly named as A. cinereus (Illiger, 1815). Also referred to as Amblonyx cinereus (Illiger, 1815), Amblonyx concolor Rafinesque, 1832 and Amblonyx cinerea by Pocock 1941. Two subspecies were reported (Pocock 1941) (1) A. c. concolor in northeast India, Myanmar extending to Sumatra and (2) A. c. nirnai in the hill ranges of southern India (Hussain et al. 2011).

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2acde ver 3.1
Year Published: 2015
Date Assessed: 2014-06-01
Assessor(s): Wright, L., de Silva, P., Chan, B. & Reza Lubis, I.
Reviewer(s): Hussain, S.A. & Duplaix, N.
This species is confirmed to be Vulnerable under criterion A2acde due to an inferred past population decline because of habitat loss and exploitation. In the last few decades, the range of Asian Small-clawed Otter has shrunk particularly in its western portion, as evident from the published literature. Given the extent of loss of habitat that is occurring in south and southeast Asia and the intensity of poaching the reduction in population has been observed in many parts of its range including India (Hussain 1993, Melisch et al. 1996, Meena 2001, Hussain 2002, Gonzalez 2010, Hussain et al. 2011). It is believed to be either extirpated or extremely rare throughout much of its range in southern China (Foster-Turley and Santiapillai 1990). The threats to Small-clawed Otter are prominent in its western range so much so that over the last 60 years its range has shrunk considerably moving west to east from Himachal Pradesh to Assam (Hussain et al. 2011). Likewise in Indochina, the range of the species is shrinking, and hunting appears to play a major role in its rapid decline in the eastern end of its global range. Although quantitative data on population sizes or trends are lacking, it is inferred that the global population of the Asian Small-clawed Otter has declined by >30% over the past 30 years (three generations based on Pacifici et al. 2013).
Previously published Red List assessments:
2008 Vulnerable (VU)
2004 Near Threatened (NT)
2000 Lower Risk/near threatened (LR/nt)
1996 Lower Risk/near threatened (LR/nt)
1996 Lower Risk/near threatened (LR/nt)
1994 Insufficiently Known (K)
1990 Insufficiently Known (K)
1988 Insufficiently Known (K)

Geographic Range [top]

Range Description:

The Asian Small-clawed Otter has a large distribution range, extending from India in South Asia eastwards through Southeast Asia to Palawan (Philippines), Taiwan and southern China (Mason and Macdonald 1986, Wozencraft 1993, Hussain 2000, Hussain et al. 2011). In India it occurs in West Bengal, Assam and Arunachal Pradesh as well as in southern Indian hill ranges of Coorg (Karnataka), Ashambu, Nilgiri and Palni hills (Tamil Nadu) and some places in Kerala (Pocock 1941, Prater 1971, Hussain 2000, Hussain et al. 2011). It used to occur in the Western Himalayan foothills (Himachal Pradesh) but recent surveys have not found its evidence (Hussain 2002, Hussain et al. 2011). Its presence has recently been confirmed from several survey sites in Odisha in eastern India (Mohapatra et al. 2014). In recent years, it has established itself in the wild in England after escaping from captivity (Jefferies 1990, 1991).

Countries occurrence:
Bangladesh; Bhutan; Brunei Darussalam; Cambodia; China; India (Arunachal Pradesh, Assam, Himachal Pradesh, Karnataka, Kerala, Tamil Nadu, West Bengal); Indonesia; Lao People's Democratic Republic; Malaysia; Myanmar; Nepal; Philippines; Singapore; Taiwan, Province of China; Thailand; Viet Nam
United Kingdom (Great Britain)
Upper elevation limit (metres): 2000
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: In most of their range the Asian Small-clawed Otter is sympatric with Smooth-coated and Eurasian otters. In India, all three species occur in the Western Ghats and in northeast India where the species occur in small group of two to four individuals. In the Western Ghats they are mostly found along the hill streams. They were once common in the mangroves of east Calcutta and Sunderbans (Sanyal 1991). The Asian Small-clawed Otters occur in freshwater and peat swamp forests, rice fields, lakes, streams, reservoirs, canals, mangrove and along the coast (Sivasothi and Nor 1994). In Malaysia and Indonesia they occur in coastal wetlands, and along the banks of paddy fields. Comparable data from Java, Myanmar, and India revealed that the Asian Small-clawed Otters have a high climatic and trophic adaptability in south and southeast Asian tropics, occurring from coastal wetlands up to mountain streams (Melisch et al.1996). A reliable population estimate of the Asian Small-clawed Otter is lacking. As many as 15 individuals were seen in a group in Malaysia (Wayre 1978), four to eight in coastal Sabah (Mason and Macdonald 1986) and two to four in India. In south China and Cambodia the population seems to be very small and declining.
Current Population Trend: Decreasing
Additional data:
Continuing decline of mature individuals: Yes
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: The typical habitats of the Asian Small-clawed Otter in west Java are wetland systems having pools and stagnant water, including shallow stretches, with depth less than 1 m. These habitats are represented by freshwater swamps, meandering rivers, mangroves and tidal pools. Muller (1839) observed Small-clawed Otter from slow-flowing lowland streams to submontane streams dominated by rocks and boulders in forested areas. Irrigated rice fields with many crab species (Brachyura) are extensively used by Small-clawed Otter if proper shelter for them is available. These can act as suitable man made habitats (Melisch et al. 1996). In Thailand, the rapid-flowing upper areas of the Huay Kha Khaeng are dominated by Lutra lutra, the slowly meandering river near the dam and the dam itself were used by Lutrogale perspicillata while the Asian Small-clawed Otter occurred mostly in the middle sections, but also at the upper reaches. When different otter species occurred in the same site there was evidence of difference in use of the habitats. Signs of the of Small-clawed Otter were found wandering further away from the river than the two other species, between patches of reeds and river debris where crabs were more likely to be found (Kruuk et al. 1994).

In west Java, its presence is positively correlated with slow flowing and stagnant broad rivers and smaller streams, depicting a distinct decline in preference from slow to deep-water bodies. On the other hand, they also use shallow fast-flowing mountain creeks narrower than 5 m, particularly when the course of the streams includes natural pools. In rice fields, they chose slow-flowing irrigation channels narrower than 2 m and with a varied, moderate or low vegetation structure. Like Smooth-coated Otter the Asian Small-clawed Otter dislike bare and open areas that do not offer any shelter (Melisch et al. 1996). It prefers pond areas and rice fields than the rivers, whereas it uses mangroves and lakes in proportion to their availability (Melisch et al. 1996). In riverine systems it prefers moderate and low vegetation structure, though their presence was also observed from banks with poor vegetation cover. Neither in ponds nor in rice field areas did they show preference for any of the vegetation structure categories, though poor nor bare structural conditions were the least favoured both in riverine and pond areas and along the rice fields.

The Small-clawed Otter is adapted to feed on invertebrates as evident from the last two upper teeth (pm4 and m3) which are larger in size for crushing the exoskeleton of crabs and other hard shelled prey. The Small-clawed Otter feeds mainly on crabs, snails and other molluscs, insects and small fish such as gouramis and catfish (Pocock 1941, Wayre 1978). They supplement their diet with rodents, snakes and amphibians too.

During a study in Malaysia, Foster-Turley (1992) examined 328 scats and found that around 80.8% of the scats consisted of crabs, 77.8% fish, 12.5% insects and 4.0% snails. This is the first study in which quantitative information on the diet of wild small-clawed otter was made. This study revealed that though the small-clawed otter is adapted for an invertebrate diet it substantiates its diet with large quantity of fish. Apart from crabs, the major prey item for small-clawed otter was the mudskipper (Gobioidei). This was recorded in the 48% of the scats. The other important prey was Trichogaster spp. and Anabantidae fish, which were represented in 27.4% scats. As evident from the scats the major fish prey were Trichogaster spp 20.7%, Anabis testudineus 5.2%, Clarius spp 2.4% and Channa striatus 1.5%. Apart from these the small-clawed otter in Malaysia also fed on snakes, frogs and insects. Foster-Turley (1992) also examined the diet composition at four different times of the year coinciding with different water levels in the rice fields and concluded that the diet of the small-clawed otter was significantly different at different times of the year. Only the relatively rare dietary components of rodents, snails and snakehead fish (Clarius spp.) showed no significant difference among seasons. Crabs were always the most prevalent food items, but the frequency of occurrence in scats varied from 70.4% to 93.2%. Similarly, though the mudskippers were the second most important food items, they were consumed in significantly different amounts in different seasons from a low of 27.3% to 63.6%. The amount of Trichogaster, Anabis and the Anbantidae also varied considerably. This difference in the use of these prey are most likely due to difference in the life cycle and availability of these prey at different times of the year.

Preliminary analysis of the small-clawed otter spraints from west Java showed their preference for crabs in both natural and man-made habitats (Melisch et al. 1996). In 87% of all collected spraints, crabs formed the dominant prey. Remaining part of the spraints consisted of fish bones and scales, ribs and vertebrae, unidentified mammalian hair, shrimps, insects and snake scales.In the Huay Kha Khaeng, Thailand almost 90% of the spraints of small-clawed otter contained remains of crabs Potamon smithianus, whereas 5% scats contained each of Fish and Amphibians. Apart from this, in few scats evidences of rodents and other arthropods were also found. Kruuk et al. (1994) estimated the preference for various size classes of crabs eaten by small-clawed otter. Of the 92 scats, 14 scats had crabs size 10-14 cm, 42 scats had 15-19 cm, 26 had 20-24 cm, 12 had 25-29 cm, 4 had 30-34 and 1 had 40-44 cm. The size distribution of crabs taken by small-clawed otter was similar to what was available, and there was not much evidence for selection of specific size. In west Java a preliminary estimate of preferred size confirmed an average of 3-4 cm carapace width (Melisch et al. 1996).

The sexual behaviour of small clawed otter has been observed in as young as 18 months old. In captivity, successful breeding has been reported for 2.1 year females and 2.8 year males. The youngest animal to reproduce was a female of 13 months captive born at Bronx Zoo, and the oldest was a 15 years male at the National Zoo, USA (Foster-Turley and Engfer 1988). In the females oestrous cycle has duration of anywhere from 28 to 30 days, with breeding occurring the year round (Lancaster 1975). Some facilities report this cycle extending to "every few months" with older animals. Oestrus lasts from one to thirteen days. Behavioural signs of the onset of oestrus may include increased rubbing and marking.

In captivity mating usually takes place in the water, but has also been observed on land on a few occasions. In most cases the exact gestation period could not be ascertained but it is believed to be around 60-86 days (Lancaster 1975, Sobel 1996). The litter size ranges from 2-7. Life span in captivity is around 11 years (Crandall 1964).
Systems: Terrestrial; Freshwater; Marine
Continuing decline in area, extent and/or quality of habitat: Yes
Generation Length (years): 10

Use and Trade [top]

Use and Trade: For information on Use see Threats.

Threats [top]

Major Threat(s): The threat to Small-clawed Otter is similar to that of Smooth-coated and Eurasian otters. Throughout Asia the potential threat to its continued survival is destruction of its habitats due to changing land use pattern in the form of developmental activities. In many parts of Asia, the habitats have been reduced due to reclamation of peat swamp forests and mangroves, aquaculture activities along the intertidal wetlands and loss of hill streams. In India the primary threats are loss of habitats due to tea and coffee plantations along the hills, in the coastal areas loss of mangroves due to aquaculture and increased human settlements and siltation of smaller hill streams due to deforestation. Increased influx of pesticides into the streams from the plantations reduces the quality of the habitats. The threat posed by poaching is still very significant in many parts of India, and SE Asia and will certainly count as a major threat that needs to be constantly monitored. Poaching for pelt has been reported from across the Western Ghats in south India (Prakash et al. 2012).

Another important threat to Asian Small-clawed Otter is reduction in prey biomass due to over-exploitation, which make its remaining habitats unsustainable. Pollution is probably the single most important factor causing decline in the population of many fish species (Dehadrai and Ponniah 1997). Reduction in prey biomass affects otter population, and organochloric and heavy metal contamination interferes with their normal physiology leading to the decline in population. The threats to Small-clawed Otter is prominent in its western range so much so that since last 60 years its range has shrunk considerable moving west to east from Himachal Pradesh to Assam (Hussain et al. 2011).

Conservation Actions [top]

Conservation Actions: Since 1977, The Asian Small-clawed Otter has been listed on CITES Appendix II which indicates that the species is not necessarily threatened with extinction, but the trade on its pelt must be controlled in order to avoid utilization incompatible with their survival. However, most range countries are not able to control the clandestine trade leading to extensive poaching. Nevertheless, it is a protected species in almost all the range countries which prohibits its killing. The Asian Small-clawed Otter was once common in the streams and wetlands of south and Southeast Asia but is now restricted to a few protected areas. Creation of networks of Protected Areas, identification of sites as wetlands of national and international importance under the Ramsar Convention has to some extent halted the degradation of its habitat.

Over the years the IUCN SSC Otter Specialist Group has developed a cadre of biologists across Asia to conduct field surveys and to popularise otter conservation by promoting otters as ambassadors of the wetlands. However, concerted efforts to conserve this species are needed. For the long term survival of the species, policy based action, research on factors affecting its survival, habitat based action on creation and where required expansion of protected areas and communication and awareness building actions are needed.

Classifications [top]

1. Forest -> 1.6. Forest - Subtropical/Tropical Moist Lowland
suitability: Suitable season: resident major importance:Yes
1. Forest -> 1.7. Forest - Subtropical/Tropical Mangrove Vegetation Above High Tide Level
suitability: Suitable season: resident major importance:Yes
1. Forest -> 1.8. Forest - Subtropical/Tropical Swamp
suitability: Suitable season: resident major importance:Yes
1. Forest -> 1.9. Forest - Subtropical/Tropical Moist Montane
suitability: Unknown  
3. Shrubland -> 3.6. Shrubland - Subtropical/Tropical Moist
suitability: Unknown  
4. Grassland -> 4.6. Grassland - Subtropical/Tropical Seasonally Wet/Flooded
suitability: Suitable season: resident major importance:Yes
5. Wetlands (inland) -> 5.1. Wetlands (inland) - Permanent Rivers/Streams/Creeks (includes waterfalls)
suitability: Suitable season: resident major importance:Yes
5. Wetlands (inland) -> 5.2. Wetlands (inland) - Seasonal/Intermittent/Irregular Rivers/Streams/Creeks
suitability: Suitable season: resident major importance:No
5. Wetlands (inland) -> 5.3. Wetlands (inland) - Shrub Dominated Wetlands
suitability: Suitable season: resident major importance:Yes
5. Wetlands (inland) -> 5.4. Wetlands (inland) - Bogs, Marshes, Swamps, Fens, Peatlands
suitability: Suitable season: resident major importance:Yes
5. Wetlands (inland) -> 5.5. Wetlands (inland) - Permanent Freshwater Lakes (over 8ha)
suitability: Suitable  major importance:No
5. Wetlands (inland) -> 5.6. Wetlands (inland) - Seasonal/Intermittent Freshwater Lakes (over 8ha)
suitability: Suitable  major importance:No
5. Wetlands (inland) -> 5.7. Wetlands (inland) - Permanent Freshwater Marshes/Pools (under 8ha)
suitability: Suitable season: resident major importance:Yes
5. Wetlands (inland) -> 5.8. Wetlands (inland) - Seasonal/Intermittent Freshwater Marshes/Pools (under 8ha)
suitability: Suitable  major importance:No
5. Wetlands (inland) -> 5.9. Wetlands (inland) - Freshwater Springs and Oases
suitability: Marginal  
5. Wetlands (inland) -> 5.13. Wetlands (inland) - Permanent Inland Deltas
suitability: Suitable season: resident major importance:Yes
5. Wetlands (inland) -> 5.14. Wetlands (inland) - Permanent Saline, Brackish or Alkaline Lakes
suitability: Marginal  
5. Wetlands (inland) -> 5.15. Wetlands (inland) - Seasonal/Intermittent Saline, Brackish or Alkaline Lakes and Flats
suitability: Marginal  
5. Wetlands (inland) -> 5.16. Wetlands (inland) - Permanent Saline, Brackish or Alkaline Marshes/Pools
suitability: Marginal  
5. Wetlands (inland) -> 5.17. Wetlands (inland) - Seasonal/Intermittent Saline, Brackish or Alkaline Marshes/Pools
suitability: Marginal  
9. Marine Neritic -> 9.10. Marine Neritic - Estuaries
suitability: Suitable  major importance:Yes
12. Marine Intertidal -> 12.5. Marine Intertidal - Salt Marshes (Emergent Grasses)
suitability: Suitable season: resident major importance:Yes
13. Marine Coastal/Supratidal -> 13.4. Marine Coastal/Supratidal - Coastal Brackish/Saline Lagoons/Marine Lakes
suitability: Suitable  major importance:No
13. Marine Coastal/Supratidal -> 13.5. Marine Coastal/Supratidal - Coastal Freshwater Lakes
suitability: Suitable  major importance:No
15. Artificial/Aquatic & Marine -> 15.2. Artificial/Aquatic - Ponds (below 8ha)
suitability: Marginal  
15. Artificial/Aquatic & Marine -> 15.3. Artificial/Aquatic - Aquaculture Ponds
suitability: Marginal  
15. Artificial/Aquatic & Marine -> 15.7. Artificial/Aquatic - Irrigated Land (includes irrigation channels)
suitability: Suitable season: resident major importance:No
15. Artificial/Aquatic & Marine -> 15.8. Artificial/Aquatic - Seasonally Flooded Agricultural Land
suitability: Suitable season: resident major importance:No
15. Artificial/Aquatic & Marine -> 15.9. Artificial/Aquatic - Canals and Drainage Channels, Ditches
suitability: Suitable season: resident major importance:No
1. Land/water protection -> 1.1. Site/area protection
1. Land/water protection -> 1.2. Resource & habitat protection
2. Land/water management -> 2.1. Site/area management
2. Land/water management -> 2.3. Habitat & natural process restoration
3. Species management -> 3.2. Species recovery
4. Education & awareness -> 4.2. Training
4. Education & awareness -> 4.3. Awareness & communications
5. Law & policy -> 5.1. Legislation -> 5.1.3. Sub-national level
5. Law & policy -> 5.4. Compliance and enforcement -> 5.4.3. Sub-national level
6. Livelihood, economic & other incentives -> 6.1. Linked enterprises & livelihood alternatives

In-Place Research, Monitoring and Planning
  Action Recovery plan:No
  Systematic monitoring scheme:No
In-Place Land/Water Protection and Management
  Conservation sites identified:Yes, over part of range
  Occur in at least one PA:Yes
  Area based regional management plan:Yes
  Invasive species control or prevention:Not Applicable
In-Place Species Management
  Harvest management plan:No
  Successfully reintroduced or introduced beningly:No
  Subject to ex-situ conservation:Unknown
In-Place Education
  Subject to recent education and awareness programmes:Yes
  Included in international legislation:Yes
  Subject to any international management/trade controls:Yes
1. Residential & commercial development -> 1.1. Housing & urban areas
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

2. Agriculture & aquaculture -> 2.1. Annual & perennial non-timber crops -> 2.1.1. Shifting agriculture
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

2. Agriculture & aquaculture -> 2.1. Annual & perennial non-timber crops -> 2.1.3. Agro-industry farming
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

2. Agriculture & aquaculture -> 2.4. Marine & freshwater aquaculture -> 2.4.3. Scale Unknown/Unrecorded
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

4. Transportation & service corridors -> 4.1. Roads & railroads
♦ timing: Ongoing    
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

5. Biological resource use -> 5.1. Hunting & trapping terrestrial animals -> 5.1.1. Intentional use (species is the target)
♦ timing: Ongoing    
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

5. Biological resource use -> 5.1. Hunting & trapping terrestrial animals -> 5.1.2. Unintentional effects (species is not the target)
♦ timing: Ongoing    
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.2. Species disturbance
  • 2. Species Stresses -> 2.3. Indirect species effects -> 2.3.7. Reduced reproductive success

5. Biological resource use -> 5.1. Hunting & trapping terrestrial animals -> 5.1.3. Persecution/control
♦ timing: Ongoing    
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.5. Motivation Unknown/Unrecorded
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

5. Biological resource use -> 5.4. Fishing & harvesting aquatic resources -> 5.4.4. Unintentional effects: (large scale)
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.3. Indirect ecosystem effects
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.3. Indirect species effects -> 2.3.8. Other

7. Natural system modifications -> 7.2. Dams & water management/use -> 7.2.11. Dams (size unknown)
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

7. Natural system modifications -> 7.3. Other ecosystem modifications
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

9. Pollution -> 9.2. Industrial & military effluents -> 9.2.3. Type Unknown/Unrecorded
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

9. Pollution -> 9.3. Agricultural & forestry effluents -> 9.3.4. Type Unknown/Unrecorded
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

1. Research -> 1.1. Taxonomy
1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
1. Research -> 1.5. Threats
1. Research -> 1.6. Actions
2. Conservation Planning -> 2.1. Species Action/Recovery Plan
2. Conservation Planning -> 2.3. Harvest & Trade Management Plan
3. Monitoring -> 3.1. Population trends

♦  Food - human
 Local : ✓   National : ✓ 

♦  Construction or structural materials
 Local : ✓ 

♦  Wearing apparel, accessories
 Local : ✓ 

Bibliography [top]

Badola, R. 1997. Human-forest relationship linking the Rajaji-Corbett forest corridor. Ph.D. Thesis, School of Economics, Jiwaji University, Gwalior, India.

Crandall, L.S. 1964. The Management of Wild Animals in Captivity. University of Chicago Press, Chicago, USA.

Dehadrai, P.V. and Ponniah, A.G. 1997. Conserving India's fish Biodiversity. International Journal of Ecology and Environmental Sciences 23: 315-326.

Fish, F.E. 1994. Association of propulsive swimming mode with behaviour in the river otters (Lutra canadensis). Journal of Mammalogy 75: 989-997.

Foster-Turley, P. 1992. Conservation ecology of sympatric Asian otters Aonyx cinerea and Lutra perspicillata. Ph.D. Thesis, University of Florida.

Foster-Turley, P. and Engfer, S. 1988. The species survival plan for the Asian Small-clawed Otter, Aonyx cinerea. International Zoo Yearbook 27: 79-84.

Foster-Turley, P. and Santiapillai, C. 1990. Action plan for Asian otters. In: P. Foster-Turley, S. Macdonald and C. Mason (eds), Otters: an Action Plan for their Conservation, IUCN, Gland, Switzerland.

Gonzalez, J.B. 2010. Distribution, Exploitation and Trade Dynamics of Asian Small-clawed Otter Amblonyx cinereus Illiger 1815 in Mainland Palawan, Philippines. BSc thesis. Western Philippines University Puerto Princesa Campus.

Harris, C.J. 1968. Otters: A Study of the Recent Lutrinae. Weidenffeld and Nicolson, London, UK.

Hoffmann, M., Hilton-Taylor, C., Angulo, A., Böhm, et al. 2010. The impact of conservation on the status of the world’s vertebrates. Science 330: 1503–1509. DOI: 10.1126/science.1194442.

Hon, N., Neak, P., Khov, V. and Cheat, V. 2010. Food And Habitat Of Asian Small-Clawed Otters In Northeastern Cambodia. IUCN Otter Specialist Group Bulletin 27(1): 12-23.

Hussain, S.A. 1993. Aspects of the ecology of smooth-coated otters Lutra perspicillata in National Chambal Sanctuary. Unpublished Ph.D Thesis. Centre for Wildlife and Ornithology. Aligarh Muslim University. Aligarh, India.

Hussain, S.A. 1999. Species profile: Mustelids, Viverrids and Herpestids of India. ENVIS Bulletin on Wildlife & Protected Areas 2(2): 1-38.

Hussain, S.A. 2000. Status of otter conservation in India. ENVIS Bulletin on Wildlife and Protected Areas 2(2): 92-97.

Hussain, S.A. 2002. Status of otter in the Tarai and lower Himalayas of Uttar Pradesh. IUCN Otter Specialist Group Bulletin.

Hussain, S.A., Gupta, S.K. and de Silva, P.K. 2011. Biology and Ecology of Asian Small-Clawed Otter Aonyx cinereus (Illiger, 1815): A review. IUCN Otter Specialist Group Bulletin 28(2): 63-75.

IUCN. 2015. The IUCN Red List of Threatened Species. Version 2015.2. Available at: (Accessed: 23 June 2015).

Jefferies, D.J. 1989. The Asian short clawed otter Amblonyx cinerea (Illiger) living wild in Britain. Otters (Earsham) 2(3): 21-25.

Jefferies, D.J. 1991. Another record of an Asian short-clawed otter living free in Oxford with notes on its implications. Journal of the Otter Trust 2(5): 9-12.

Kruuk, H., Kanchanasaka, B., O'Sullivian, S. and Wanghongsa, S. 1994. Niche separation in three sympatric otters Lutra perspicillata, Lutra lutra and Aonyx cinerea in Huai Kha Khaeng, Thailand. Biological Conservation 69: 115-210.

Lancaster, W.E. 1975. Exhibiting and breeding the Asian small-clawed otter at Adelaide Zoo. International Zoo Yearbook 15: 63-65.

Lau, W-N.M., Fellowes, J.R. and Chan, B.P.L. 2010. Carnivores (Mammalia: Carnivora) in South China: a status review with notes on the commercial trade. Mammal Rev. 40(4): 247-292.

Lekagul, B. and McNeely, J.A. 1988. Mammals of Thailand. Association for the Conservation of Wildlife, Bangkok, Thailand.

Leslie, G. 1970. Observations on the oriental short-clawed otter, Aonyx cinerea, at Aberdeen Zoo.

Mason, C.F. and Macdonald, S.M. 1986. Otters: Ecology and Conservation. Cambridge University Press, Cambridge, UK.

Medway, L. 1969. The Wild Mammals of Malaya and Offshore Islands Including Singapore. Oxford University Press, London, UK and Oxford, UK.

Meena, V. 2001. Otter poaching in Palni Hills. Zoo’s Print Journal 17: 696-698.

Melisch, R., Kusumawardhani, L., Asmoro, P.B. and Lubis, I.R. 1996. The otters of west Java - a survey of their distribution and habitat use and a strategy towards a species conservation programme. PHPA/Wetlands International – Indonesia Programme, Bogor, Indonesia.

Mohapatra, P.M., Palei, H.S. and Hussain, S.A. 2014. Occurrence of Asian small-clawed otter Aonyx cinereus in Eastern India. Current Science 107(3): 367-370.

Pacifici, M., Santini, L., Di Marco, M., Baisero, D., Francucci, L., Grottolo Marasini, G., Visconti, P. and Rondinini, C. 2013. Generation length for mammals. Nature Conservation 5: 87–94.

Perinchery, A., Jathanna, D. and Kumar, A. 2011. Factors determining occupancy and habitat use by Asian small-clawed otters in the Western Ghats, India. Journal of Mammalogy 92(4): 796-802.

Pocock, R.I. 1941. The Fauna of British India, including Ceylon and Burma. Taylor & Francis, Ltd., London, UK.

Prakash, N., Mudappa, D., Raman, T.R.S. and Kumar, A. 2012. Conservation of the Asian small-clawed otter (Aonyx cinereus) in human-modified landscapes, Western Ghats, India. Tropical Conservation Science 5: 67-78.

Prater, S. 1971. The Book of Indian Animals. Bombay Natural History Society, Bombay, India.

Sanyal, P. 1991. Otters of West Bengal, India, with special reference to a study area near Calcutta. Habitat 6.

Schipper, J., Chanson, J. S., Chiozza, F., Cox, N. A., Hoffmann, M., Katariya, V., Lamoreux, J., Rodrigues, A. S. L., Stuart, S. N., Temple, H. J., Baillie, J., Boitani, L., Lacher T. E. Jr., Mittermeier, R. A., Smith, A. T., Absolon, D., Aguiar, J. M., Amori, G., Bakkour, N., Baldi, R., Berridge, R. J., Bielby, J., Black, P. A., Blanc, J. J., Brooks, T. M., Burton, J. A., Butynski, T. M., Catullo, G., Chapman, R., Cokeliss, Z., Collen, B., Conroy, J., Cooke, J. G., da Fonseca, G. A. B., Derocher, A. E., Dublin, H. T., Duckworth, J. W., Emmons, L., Emslie, R. H., Festa-Bianchet, M., Foster, M., Foster, S., Garshelis, D. L., Gates, C., Gimenez-Dixon, M., Gonzalez, S., Gonzalez-Maya, J. F., Good, T. C., Hammerson, G., Hammond, P. S., Happold, D., Happold, M., Hare, J., Harris, R. B., Hawkins, C. E., Haywood, M., Heaney, L. R., Hedges, S., Helgen, K. M., Hilton-Taylor, C., Hussain, S. A., Ishii, N., Jefferson, T. A., Jenkins, R. K. B., Johnston, C. H., Keith, M., Kingdon, J., Knox, D. H., Kovacs, K. M., Langhammer, P., Leus, K., Lewison, R., Lichtenstein, G., Lowry, L. F., Macavoy, Z., Mace, G. M., Mallon, D. P., Masi, M., McKnight, M. W., Medellín, R. A., Medici, P., Mills, G., Moehlman, P. D., Molur, S., Mora, A., Nowell, K., Oates, J. F., Olech, W., Oliver, W. R. L., Oprea, M., Patterson, B. D., Perrin, W. F., Polidoro, B. A., Pollock, C., Powel, A., Protas, Y., Racey, P., Ragle, J., Ramani, P., Rathbun, G., Reeves, R. R., Reilly, S. B., Reynolds III, J. E., Rondinini, C., Rosell-Ambal, R. G., Rulli, M., Rylands, A. B., Savini, S., Schank, C. J., Sechrest, W., Self-Sullivan, C., Shoemaker, A., Sillero-Zubiri, C., De Silva, N., Smith, D. E., Srinivasulu, C., Stephenson, P. J., van Strien, N., Talukdar, B. K., Taylor, B. L., Timmins, R., Tirira, D. G., Tognelli, M. F., Tsytsulina, K., Veiga, L. M., Vié, J.-C., Williamson, E. A., Wyatt, S. A., Xie, Y., and Young, B. E. 2008. The status of the World’s land and marine mammals: diversity, threat, and knowledge. Science 322: 225-230.

Sivasothi, N. and Burhanuddin, N. 1994. A review of otters (Carnivora: Mustelidae: Lutrinae) in Malaysia and Singapore. Hydrobiologia 285: 151-170.

Sobel, G. 1996. Development and validation of noninvasive, fecal steroid monitoring procedures for the Asian small-clawed otter: Aonyx cinerea. M.Sc.Thesis, University of Florida, Florida, USA.

Wayre, P. 1978. Status of otters in Malaysia, Sri Lanka and Italy. In: N. Duplaix (ed.), Otters, pp. 152-155. IUCN, Gland, Switzerland.

Wozencraft, W.C. 1993. Order Carnivora. In: D.E. Wilson and D.M. Reeder (eds), Mammal Species of the World: A Taxonomic and Geographic Reference. Second Edition, pp. 279-344. Smithsonian Institution Press, Washington, DC, USA.

Citation: Wright, L., de Silva, P., Chan, B. & Reza Lubis, I. 2015. Aonyx cinereus. The IUCN Red List of Threatened Species 2015: e.T44166A21939068. . Downloaded on 30 November 2015.
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