Well, here's the answer :

2- The first is called "hipposudoric acid" and the second is called "norhipposudoric acid".



3- Since these are strong acids, they deter the growth of bacteria on the skin.





4- In addition, hipposudoric acid is colored bright red while norhipposudoric acid is colored bright orange.





5- The combination of these two acids provides hippopotamuses with a sunscreen effect because these colors absorb dangerous, cell-destroying ultraviolet light.



6- milk is most likely pink due to the combination of these acidic secretions with off-white milk (red + white = pink). Hippopotamus milk is most likely pink due to the combination of these acidic secretions with off-white milk (red + white = pink).



