Eurasian Otter (Lutra lutra) has the most widespread distribution of all otters, however population data is vastly unknown. Young otters aren't good swimmers, so they're dragged into the waters by their mother after 4 months old to quickly learn and hunt.

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Hairy Nosed Otter (Lutra sumatrana) is an endangered species in the South East Asia believed to be extinct in 1998 however small populations were found since then. This otter has a distinctive hairy nose while most mammal noses are moist and naked.

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Neotropical Otter (Lontra longicaudis) lives in the swamp forests of Central and South America. They are the most adaptive among other otter species as they can live in a wide variety of habitats, from forest streams to irrigation ditches of rice plantations.

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African Clawless Otter (Aonyx capensis) is an otter similar to the Congo clawless otter that can be found in sub-Saharan Africa excluding the rainforest areas. They are listed as near threatened due to increasing human population and overgrazing.

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Congo Clawless Otter (Aonyx congicus) aka swamp otter is one of the least known otter species that can be found in Congo Basin at central equatorial Africa. Despite being clawless, they have very dexterous fingers to dig for worms, crabs, and frogs.

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North American River Otter (Lontra canadensis) is distributed throughout America and Canada, however disappeared in some states due to hunting, pollution, and habitat loss. Their population has been restored but trapping for their fur is still a common trade.

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