Hippopotamuses produce two unique skin secretions (so unique they're named after the animal), "hipposudoric acid" and its analog "norhipposudoric acid". It gives the hippopotamuses' sweat a red coloration, commonly believed to be blood (it's not). The acids act as a sunscreen and antimicrobial. The pink coloration is the mixture of these pigmented excretions and the white mammalian milk.
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