Fur Keeps Heat in and Cold Water Out

Otters and seals have a two‑layer fur system that prevents water penetration and creates an insulating layer. Aquatic mammals such as otters and seals face a serious physical challenge: they must stay warm while spending significant periods of time in extremely cold waters. Sea lions and walruses have thick layers of blubber to keep them warm, while fur seals have much thinner layers, and otters do not have any blubber at all. Read full strategy at: >>