Do Hippopotamuses have pink colored sweat? What is the reason for it?

Yes! But ‘sweat’ is a misnomer. A hippo (to call by its informal name) does not have sweat glands underneath its skin for release of excess heat of the body. It spends a large part of the day in water which keeps it cool and also takes much of its three tonnes weight off its squat legs through displacement. Still, it has to spend five or six hours on the ground daily foraging for food. A thin layer of light pink colored liquid is seen on its body during this time.

This liquid is not sweat. It so happens that hippo’s skin becomes dry as soon as it comes out of water. Further, its skin is comparatively thin and soft, but has large pores on it. In dry air hippo’s body loses water at a faster rate which is four times greater then that of a human being. So to prevent its dry skin from cracking Nature has provided hippo with a gland that secretes a cold cream-like thick sticky liquid. After filing up pores that pink liquid becomes somewhat dense and closes the poses to prevent water loss. Hippo is the only animal which in spite of being ugly cannot do without its cosmetic ‘cold cream’.

Additional reading:
Hippopotamus (Wikipedia)

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