Animalia > Chordata > Mammalia > Carnivora > Mustelidae > Enhydra > Enhydra lutris

Enhydra lutris (Sea Otter)

Synonyms: Mustela lutris
Language: Spanish

Wikipedia Abstract

The sea otter (Enhydra lutris) is a marine mammal native to the coasts of the northern and eastern North Pacific Ocean. Adult sea otters typically weigh between 14 and 45 kg (31 and 99 lb), making them the heaviest members of the weasel family, but among the smallest marine mammals. Unlike most marine mammals, the sea otter's primary form of insulation is an exceptionally thick coat of fur, the densest in the animal kingdom. Although it can walk on land, the sea otter lives mostly in the ocean.
View Wikipedia Record: Enhydra lutris


Enhydra lutris kenyoni (northern sea otter)
Enhydra lutris lutris (sea otter)
Enhydra lutris nereis (southern sea otter)

Endangered Species

Status: Endangered
View IUCN Record: Enhydra lutris

EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 6.58
EDGE Score: 4.1


Adult Weight [2]  62.78 lbs (28.48 kg)
Birth Weight [3]  4.12 lbs (1.87 kg)
Female Weight [2]  52.03 lbs (23.60 kg)
Male Weight [2]  73.52 lbs (33.35 kg)
Weight Dimorphism [2]  41.3 %
Female Maturity [3]  2 years 8 months
Male Maturity [3]  3 years 9 months
Diet [4]  Carnivore (Invertebrates), Piscivore
Diet - Fish [4]  50 %
Diet - Invertibrates [4]  50 %
Forages - Marine [4]  100 %
Gestation [3]  4 months 20 days
Litter Size [3]  1
Litters / Year [3]  1
Maximum Longevity [3]  27 years
Speed [5]  5.59 MPH (2.5 m/s)
Water Biome [1]  Coastal
Weaning [3]  5 months 25 days

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Cabrillo National Monument V 149 California, United States
Channel Islands National Marine Sanctuary   California, United States
Channel Islands National Park II 139010 California, United States
Clayoquot Sound Biosphere Reserve 864738 British Columbia, Canada  
Elkhorn Slough Preserve Nature Conservancy - Preserve Ia 964 California, United States  
Gwaii Haanas National Park Reserve II 366714 British Columbia, Canada
Kenai Fjords National Park Ib 574822 Alaska, United States
Komandorsk Biosphere Reserve 9016082 Kamchatka Krai , Russia    
Kronotskiy Biosphere Reserve 361480 Russia  
Kronotsky Biosphere Reserve 2822275 Kamchatka Krai , Russia
Kurilsky State Nature Reserve 161520 Sakhalin, Russia    
Point Reyes National Seashore II 27068 California, United States
Wrangell-St. Elias National Park and Preserve Ib 2476446 Alaska, United States

Prey / Diet

Ammodytes hexapterus (Stout sand lance)[6]
Chionoecetes bairdi (southern Tanner crab)[6]
Chionoecetes opilio (snow crab)[6]
Clinocardium nuttallii (Nuttall cockle)[6]
Cryptochiton stelleri (Giant Pacific Chiton)[6]
Doryteuthis opalescens (california market squid)[7]
Echinarachnius parma (common sand dollar)[6]
Enteroctopus dofleini (North Pacific giant octopus)[7]
Entodesma navicula (rock entodesma)[6]
Haliotis kamtschatkana (pinto abalone)[8]
Hexagrammos lagocephalus (Rock greenling)[6]
Katharina tunicata (black katy)[6]
Leukoma staminea (Pacific littleneck)[6]
Melanitta perspicillata (Surf Scoter)[6]
Mesocentrotus franciscanus (Red sea urchin)[6]
Modiolus sacculifer (bag horsemussel)[6]
Nassarius fossatus (channeled nassa)[6]
Nucella lamellosa (frilled dogwinkle)[6]
Ophiodon elongatus (Lingcod)[6]
Panopea generosa (Pacific geoduck)[6]
Pleurogrammus monopterygius (Atka mackerel)[6]
Pugettia producta (northern kelp crab)[9]
Pugettia venetiae (Venice kelp crab)[6]
Pycnopodia helianthoides (Sunflower sea star)[6]
Strongylocentrotus droebachiensis (Green sea urchin)[6]
Tivela stultorum (Pismo clam)[6]

Prey / Diet Overlap

Competing SpeciesCommon Prey Count
Anoplopoma fimbria (Skil)1
Arctocephalus townsendi (Guadalupe Fur Seal)1
Brachyramphus marmoratus (Marbled Murrelet)1
Callorhinus ursinus (Northern Fur Seal)1
Caulolatilus princeps (Bighead tilefish)1
Cerorhinca monocerata (Rhinoceros Auklet)1
Citharichthys sordidus (Sanddab)1
Delphinus delphis (Short-beaked Saddleback Dolphin)1
Eopsetta jordani (Petrale sole)1
Gavia arctica (Black-throated Loon)1
Haliaeetus leucocephalus (Bald Eagle)2
Kogia breviceps (Pygmy Sperm Whale)1
Larus californicus (California Gull)1
Larus canus (Mew Gull)1
Larus glaucescens (Glaucous-winged Gull)1
Larus heermanni (Heermann's Gull)1
Lissodelphis borealis (Northern Right Whale Dolphin)1
Merluccius productus (Whiting)1
Mirounga angustirostris (Northern Elephant Seal)1
Ophiodon elongatus (Lingcod)1
Phalacrocorax penicillatus (Brandt's Cormorant)1
Phoca vitulina (Harbor Seal)2
Phocoena phocoena (Harbor Porpoise)1
Phocoenoides dalli (Dall's Porpoise)1
Physeter macrocephalus (Sperm Whale)1
Prionace glauca (Tribon blou)1
Puffinus creatopus (Pink-footed Shearwater)1
Puffinus griseus (Sooty Shearwater)1
Puffinus tenuirostris (Short-tailed Shearwater)1
Raja rhina (Longnose skate)1
Sebastes flavidus (Yellowtail rockfish)1
Sebastes melanops (Black bass)1
Somniosus pacificus (Pacific Sleeper Shark)1
Tursiops truncatus (Bottlenosed Dolphin)1
Uria aalge (Common Murre)1
Zalophus californianus (California Sealion)1


Carcharodon carcharias (Maneater shark)[6]
Eumetopias jubatus (Steller Sea Lion)[6]
Haliaeetus leucocephalus (Bald Eagle)[6]
Homo sapiens (man)[6]
Orcinus orca (Killer Whale)[6]
Zalophus californianus (California Sealion)[6]


Parasitized by 
Coccidioides immitis[10]
Corynosoma enhydri[11]
Corynosoma strumosum[10]
Corynosoma villosum[10]
Diphyllobothrium tetrapterum[11]
Microphallus enhydrae <Unverified Name>[11]
Microphallus pirum[11]
Orthosplanchnus fraterculus[11]
Phocitrema fusiforme[11]
Pricetrema zalophi[11]
Profilicollis altmani[11]
Profilicollis major[10]
Pseudoterranova decipiens[11]
Pyramicocephalus phocarum[11]

Institutions (Zoos, etc.)

Institution Infraspecies / Breed 
Aquarium of the Pacific, Long Beach
John G. Shedd Aquarium
Kamogawa Sea World
Minnesota Zoological Gardenkenyoni
Monterey Bay Aquariumnereis
New York Aquariumnereis
Oceanario de Lisboalutris
Oregon Coast Aquariumkenyoni
Pittsburgh Zoo & PPG Aquariumkenyoni
Point Defiance Zoo & Aquariumkenyoni
Vancouver Aquarium Marine Science Ctrlutris

Range Map

Europe & Northern Asia (excluding China); North America;



Monterey Bay Aquarium Otter Cam
Cam Time:
Hours: - ( - )
Feeding: Dly , ,


Attributes / relations provided by
1Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 01, 2010 at
2Enhydra lutris, James A. Estes, MAMMALIAN SPECIES No. 133, pp. 8 (1980)
3de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774
4Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
5Wikipedia licensed under a Creative Commons License
6Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
7CephBase - Cephalopod (Octopus, Squid, Cuttlefish and Nautilus) Database
8Alaska Wildlife Notebook Series, Alaska Department of Fish and Game
10Nunn, C. L., and S. Altizer. 2005. The Global Mammal Parasite Database: An Online Resource for Infectious Disease Records in Wild Primates. Evolutionary Anthroplogy 14:1-2.
11Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
Protected Areas provided by Biological Inventories of the World's Protected Areas in cooperation between the Information Center for the Environment at the University of California, Davis and numerous collaborators.
Specially protected natural territories of the Russian Federation, Ministry of Natural Resources and Environment of the Russian Federation
Images provided by Wikimedia Commons licensed under a Creative Commons License
Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access