What Does “A Raft of Otters” Mean?
“Raft” is the single most iconic and best-documented otter collective noun, describing sea otters floating together in a group at the water’s surface, often holding paws or wrapping themselves in strands of kelp to keep from drifting apart while resting or sleeping. It’s one of the more genuinely charming, well-photographed behaviors in the entire animal kingdom, and it serves a real practical purpose beyond looking adorable.
Sea otters lack the thick blubber layer most marine mammals rely on for insulation, depending instead on extremely dense fur, the densest of any mammal, to stay warm, which means staying together and staying anchored matters for both warmth and safety from currents carrying them out to sea while asleep. Rafts can range from just a couple of individuals to, in productive kelp forest habitats, over a hundred otters at once, with males and females typically forming separate rafts outside of breeding encounters.
Example: “A raft of otters drifted just offshore, several of them wrapped snugly in kelp to keep from drifting apart.”
Related: Collective Nouns for Mammals · What Is a Group of Otters Called?