Do the recent frosty mornings have you bundling up or adjusting the thermostat? Consider the mighty mustelids who must survive in chilly ocean water year-round. How do they stay warm? By fluffing up their incredibly furry coats! Sea otters boast the world’s densest fur—up to a million hairs per square inch. They also power their internal metabolic furnace by eating up to 25 percent of their body weight each day. Pass the snacks!
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