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The Red Sweat of Hippos by Yoko Saikawa et al.: Within a few minutes of perspiration, the colourless, viscous sweat of the hippopotamus gradually turns red, and then brown as the pigment polymerizes and may act as both an antibiotic and sunscreen. #Hippo #Sweat #Yoko_Saikawa


Hippos... have a strange effect on me... so wondrous that seeing them can make me weep. Very graceful under water, out of it they are among the fiercest species on earth and kill far more human beings than do sharks or large cats... and their natural sunscreen secretions make it look like they sweat blood...


Do Hippos Sweat Blood?

Do Hippos Sweat Blood? - Red Hippopotamus Sweat: The hippo mystified ancient Greeks because it appeared to sweat blood. Although hippos do sweat a red liquid, it isn't blood. The animals secrete a sticky liquid that acts as a sunscreen and topical antibiotic. Initially, hippo perspiration is colorless. As the viscous liquid polymerizes, it changes color to red and eventually brown. Droplets of perspiration resemble drops of blood, although hippo perspiration sticks to the animal's wet skin.


Hippos can stand in the hot sun all day without getting a sunburn, and now researchers know why: a red-colored glandular secretion known as "hippo sweat" contains microscopic structures that scatter light, protecting the hefty mammals from burns, according to a new study.