an animal is born with a shortage of colouring
substance in the blood, the animal is pure white,
an is called an albino. Albino guinea pigs have
such a thin eye cover, that the blood shows through
and the eye looks red.
guinea pigs have red eyes, but really they are more
pink than red, the redness here is mostly the "red
eye" photo effect. In real life, the eye is
more pinkish than red.