Aonyx cinerea | Red List of Bangladesh Volume 2: Mammals

Aonyx cinereus | (Illiger, 1815)
Aonyx cinerea | (Illiger, 1815)
NRL Record ID
Countries in Assessment
Country ISO code(s)
Does the assessment cover a marine EEZ area(s)?
Scope (Assessment)
Common Names
Oriental Small-clawed Otter
Asian Small-clawed Otter
Small-clawed Otter
Dhaira Uud
Uud Biral
RRL Synonyms
Amblonyx cinereus Illiger, 1815; Aonyx cinereus Illiger, 1815; Lutra cinerea Illiger, 1815; Amblonyx concolor Rafinesque, 1832; Amblonyx cinerea by Pocock 1941
Taxonomic Group
Taxonomic Group Level 2
Assessed taxon level
Taxonomic Notes
This species used to be known as Amblonyx cinereus. DNA work by Koepfli and Wayne (1998, 2003) indicated that the Asian Small-clawed Otter is a sister species to the African Clawless and Congo Clawless Otters. Aonyx is the older name, so the Asian Small-
Taxon distribution as listed in assessment
This species is native to Bangladesh, Bhutan, Brunei Darussalam, Cambodia, China, India (Arunachal Pradesh, Assam, Himachal Pradesh, Karnataka, Kerala, Tamil Nadu, and West Bengal), Indonesia, Lao PDR, Malaysia, Myanmar, Nepal, Philippines, Singapore, Taiwan, Thailand and Viet Nam. Introduced to United Kingdom (Great Britain). Bangladesh: Sundarbans
Habitats and Ecology
Ecological system type
Terrestrial system
Freshwater system
Marine system
Habitat details as listed in assessment
It inhabits natural habitats of ponds and lakes, rivers and streams, coastal tide pools and estuaries, freshwater and mangrove swamps and also near human habitats, especially in rice fields (Khan 2008). This species lives in extended family groups of about 12 individuals with only the alpha pair breeding; offsprings from previous years help to raise the young. It is an excellent swimmer and performs swimming by moving hind legs and tail. It can dive under water for about eight minutes. In the riverine systems, it choose areas with low vegetation and its nesting burrows are dug into the muddy banks. This species spends most of its time on land unlike most other otters. It feeds mainly on invertebrates such as crustaceans and mollusks, but is also known to feed on vertebrates, in particular amphibians (Hussain 2008, Khan 2008).
Is there a map available in assessment?
Yes, in the publication/on website
Assessed status
Asessment status in full
Assessment status abreviation
Assessment rationale/justification
In the last few decades the range of Asian Small-clawed Otter has shrunk particularly in the western portion of its range in the country. Its habitats are severely fragmented and there is an ongoing decline in the extent and quality of its habitat, as well as the number of locations and subpopulations and number of mature individuals due to anthropogenic disturbances and habitat exploitation. It is suspected that the population size is below the threshold level of Endangered category. These factors qualify this species as Endangered.
About the assessment
Assessment year
Assessors/contributors/reviewers listed
Sajeda Begum
Affliation of assessor(s)/contributors/reviewers listed on assessment
Assessor affiliation specific
Criteria system
Criteria system specifics
IUCN v3.1 + Regional Guidelines v4.0
Criteria system used
Criteria Citation
IUCN (2012) IUCN Red List Categories and Criteria: Version 3.1. Second edition. Gland, Switzerland and Cambridge, UK: IUCN. iv + 32pp; IUCN (2012) Guidelines for Application of IUCN Red List Criteria at Regional and National Levels: Version 4.0. Gland, Switzerland and Cambridge, UK: IUCN. iii + 41pp.
Endemic to region
Endemism Notes
Is an endemic?: No
Conservation Measures

Conservation measures:
Conservation measures notes:
Required conservation measures:

Further information
Endangered in Bangladesh (IUCN Bangladesh 2000).
Scientific Name Kingdom Phylum Class Order Family Genus
Aonyx cinereus Animalia Chordata Mammalia Carnivora Mustelidae Aonyx
Aonyx cinerea Animalia Chordata Mammalia Carnivora Mustelidae Aonyx