"An Afternoon Nap!"
The Hippo's skin is an unusually thin surface layer on top of a thick endodermis. The outer layer acts like a wick, allowing water loss several times greater than with other mammals. Hippos must spend so much of their time in water to prevent dehydration. They cannot stay out in the sun too long. Their pores can secrete a thick reddish substance that acts like suntan lotion, protecting the skin from sunburn.
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