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To survive, otters need clean water in relatively specific, undisturbed environments. Sea otters need clean, watery habitats with plenty of prey.
Otters are good indicators of water quality. As predators, they are high up on the food chain. Sea otters must maintain a core body temperature of 37 degrees to stay alive but live in waters where temperatures can drop to -1 degree.
On the other hand, river otters are not found in highly-polluted watersheds. Their small numbers spread across wide ranges have made them extremely vulnerable to pollution, habitat destruction, and historical, unregulated trapping.
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