River otters can be found in coastal salt marshes like those at the FSU Coastal & Marine Lab, but they prefer the fresh water of rivers, streams, ponds, lakes, and swamps. They occupy holts, which are underground caverns excavated into riverbanks or tree roots.
The sea otter and the smaller marine otter are found in the Pacific Ocean, despite the fact that the majority are located in freshwater rivers, lakes, and wetlands.
Although river otters prefer to live in or near freshwater, they will also use saltwater environments along the Atlantic and Pacific coastlines and live on islands like Noman's Land, Martha's Vineyard, and the Elizabeth Islands. The species is thought to be restricted to the open ocean, however they have lately settled on Nantucket.
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