Sea otters leave cold low temperatures

Marine mammals use their muscles to produce heat rather than movement, according to a study published Thursday in the journal Science. Unlike seals and whales, for example, they do not have thick layers of fat in cold waters.

Sea otters have lush, water-resistant fur. However, this alone is not enough to compensate for the heat loss in cold waters, otters expert Travers Wright of Texas A&M University told AFP. How animals stay warm has always been a mystery.

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