The Sea Otter’s Fur
The fur of the sea otter is denser than that of any other mammal, with some one million hairs per square inch (155,000 per sq cm).
When the otter swims, its coat traps a layer of air close to its body. That air acts as an insulator, preventing the cold water from coming into direct contact with the animal’s skin and sapping its body heat.
What do you think? Did the heat-insulating fur of the sea otter evolve? Or was it designed?
English: The Sea Otter's Fur