Do hippos sweat their blood and what causes this?

Hippos don’t actually sweat blood, but this erroneous belief is based on an oddity that bears mentioning.

A hippopotamus has no oil or sweat glands on its entire body; it does, however, sport a gland that only kicks into action when it gets excited or nervous.

This gland excretes a reddish, oozing liquid that is often mistaken for blood and coincidentally may function, in part, to scare off attackers.

do hippos sweat their blood and what causes this
About Karen Hill

Karen Hill is a freelance writer, editor, and columnist for Born in New York, she loves interesting random facts from all over the world.