When you say sweat blood!
One of the peculiarities of the hippopotamus is that of secreting a red pigment that covers its skin giving the impression that it is sweating blood !
In reality it is not blood, but a mixture of two pigments - one red, the other orange - which acts as a solar filter and disinfectant.
This secretion, in fact, is able to absorb most of the solar spectrum, protecting the hippopotamus from harmful ultraviolet rays; it also boasts antibiotic properties.
