Otters Hold Hands While Sleeping

For a sea otter, the open ocean is both a home and a constant challenge, especially during rest. To prevent the currents from pulling them apart while they sleep, these marine mammals have developed a simple yet brilliant social behavior: holding hands. This is most commonly seen between a mother and her pup, creating a vital tether that ensures the vulnerable young otter doesn't drift away. This hand-holding is part of a larger strategy for staying put; otters also wrap themselves in long strands of kelp, using the seaweed as a natural, buoyant anchor to secure their position in the water (Review).

This behavior is essential for the structure of their large resting groups, which are fittingly called 'rafts.' These rafts are often segregated by gender, with males forming their own groups separate from the females and their pups. While some rafts are small, others can be massive floating colonies containing over a thousand otters. By linking together or anchoring in the same kelp bed, the group gains safety in numbers, making it more difficult for predators like sharks or eagles to target an individual. It's a remarkable adaptation that turns a precarious nap on the waves into a safe, communal activity.