Hippos Milk is Pink

Hippopotamuses have adapted to utilize two unique
acid secretions in their skin.
The first is called "hipposudoric acid" and the
second is called "norhipposudoric acid".
Since these are strong acids, they deter the growth
of bacteria on the skin.
In addition, hipposudoric acid is colored bright red
while norhipposudoric acid is colored bright orange.
The combination of these two acids provides
hippopotamuses with a sunscreen effect because
these colors absorb dangerous, cell-destroying
ultraviolet light.
Hippopotamus milk is most likely pink due to the
combination of these acidic secretions with off-
white milk (red + white = pink).