The fur of the sea otter Enhydra lutris is the densest of all mammals, at about one hundred thousand hairs per square centimetre, and because it has no insulating fat layer it relies on its fur to keep its body warm.
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Sources
In NAKTASHIF worlds:Marine and coastal habitats
Approved version OWNER-REVIEW-20261107T153539831 · last approved 7 November 2026