Sea otters hold hands while they sleep so they don't drift apart.

Sea otters commonly rest on their backs at the water’s surface. Unlike a bed on land, the resting place moves with currents, wind and waves. Contact with another animal can help individuals remain together, while wrapping in kelp provides a different way to limit drifting.

Groups of resting sea otters are called rafts. A raft is a gathering of animals, not a physical structure they build. Paw-holding is a real behavior, but a photograph of a pair should not be turned into a claim that all otters sleep linked together every night.

The distinction between sea otters and otters generally is important. Sea otters are highly aquatic marine mammals with a different daily routine from many river otters. Statements about floating sleep, kelp and coastal rafts should not automatically be applied to every species with otter in its name.

Aquariums and field biologists describe sea otter resting, grooming and feeding from direct observation. Such accounts document behavior rather than a rule that every individual follows. The Monterey Bay Aquarium emphasizes how much of a sea otter’s life takes place in coastal water.

Pups depend heavily on their mothers. A mother may carry a small pup on her chest while floating and leave it resting at the surface while she dives for food. Contact between adults, mother-pup care and kelp anchoring are related parts of life afloat, but they are not identical behaviors.

The sea otter’s remarkable fur supplies another piece of the explanation. It lacks the thick insulating blubber associated with seals and whales. Dense, well-maintained fur traps air close to the skin, allowing an animal resting in cold water to retain heat.

Grooming helps keep the fur’s insulating air layer effective. An otter spreads oils, cleans its coat and works air through it. Fur that is dirty or contaminated cannot perform the same job properly. This is one reason an oil spill is dangerous even when an animal has not swallowed a large quantity of oil.

Sea otters also need substantial amounts of food to support their metabolism. Their prey includes shellfish and other marine invertebrates, and some individuals use rocks to open hard shells. Tool use is impressive, but it should not distract from the everyday energy demands of staying warm at sea.

Their feeding can affect entire habitats. By eating sea urchins, otters can reduce grazing pressure on kelp in some ecosystems. Kelp in turn offers a place to rest and shelter. The relationship is ecological, not an arrangement in which otters consciously cultivate a bed or cooperate to manage a forest.

It is tempting to explain paw-holding entirely in human terms, such as romance or lifelong devotion. The observed behavior does not establish those interpretations. A careful account can preserve what makes the sight appealing while distinguishing evidence for physical contact and reduced drifting from claims about an animal’s private emotions.

A floating sea otter must solve several problems at once: remaining near companions, keeping its coat functional and obtaining enough food to support life in cold water. Paw contact addresses separation, not the whole challenge of marine living. Kelp anchoring, resting in groups and meticulous grooming belong to the same daily routine, but each behavior has a different immediate purpose.