I never thought of that. I wonder if there is a correlation between animals with lots of fat/blubber and having less sensitive skin? It does seem efficiecient to have a large surface area with little contact to the body for heat preservation.
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Good question! I would assume so. While our own nerves are in the top layer of our skin, I don't see why this would make any sense for animals that often get exposed to uncomfortable situations (such as whales who swim in almost freezing water). Sadly I'm not very knowledgeable about animal physiology / anatomy, so I can't really answer you. Sorry!