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Generally diurnal, but can still be active at night if need be

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Commensalism

The kelp is not affected by the otter using it to sleep, however the otter benefits from using the kelp to sleep

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Clumped

Sea otters stay in groups and link arms to not drift while sleeping, as well as hold onto kelp

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Apex Predator of the marine nearshore environment

Can be hunted by orcas , sea lions, and bald eagles, and on ground bear and coyotes might attack them

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Sea otters are polygynous

Mating takes place in the water and can be rough, the male bites the female on the muzzle and holds her head under water, and the bite marks can turn into scars.

Births are year-round but peak in May and June in northern populations and in January and March in southern populations

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Sea otters live in water 50-75 ft deep and stay within 2/3's of a mile near the shore at all times

They are found in areas protected from ocean winds and with kelp forests

They prefer rocky sea floors but can live with mud, sand, and slit sea floors as well.

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Sea Otters consume organisms such as sea urchins, mollusks, fish, and crustaceans

They also use rocks to open preys shells and the like which makes it one of the rare mammals that use tools.

Their diet includes things that lead to conflict with humans as well, due to what they eat aligning closely with what humans like to eat.