River otters are smaller than sea otters, and move swiftly on land and water, while sea otters are larger and clumsier.
Some hold hands while sleeping
Sea otters use hand-holding and kelp to keep them from drifting away while they sleep, protecting them from the ocean.
They are in trouble
Otters are threatened by pollution, habitat destruction, overfishing, poaching, ghost nets, oil spills, and toxoplasmosis, which can enter waterways through runoff and flushable cat litter.
They have many names
Otter groups are called family, bevy, lodge, or romp, and a raft is the most common term for a group of otters in the water.