One way is that their fur is really dense to keep the warmth in.
Because they have adapted to living in salt water.
That is the way they have adapted, it is the same as asking why a fish lives in water.
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2 ways that Fish are adapted to living in water are gills and fins, or scales ( streamline) and protected eyes.
Otters are able to stay underwater for up to 8 minutes.
they adapted by to water and climate and grasslands
Otters can't breathe under water. They're mammals, they breathe air, with lungs. When they dive, they hold their breath.
The river otters Niche is its living in a hole next to the river because it cannot live in water but can live near water for drinks and stuff.
Giant River Otters do camflage by hidind in dark areas on the surface of the water and under aswell.
Animals that are adapted to living in water or on land.
The beavers den is above water and otters dens are under water.
coz the have legs so they can swim hehehe