Rhinoceros
Both black and white rhinoceroses are actually gray. They are different
not in color but in lip shape. The black rhino has a pointed upper lip,
while its white relative has a squared lip. The difference in lip shape
is related to the animals' diets. Black rhinos are browsers that get
most of their sustenance from eating trees and bushes. They use their
lips to pluck leaves and fruit from the branches. White rhinos graze on
grasses, walking with their enormous heads and squared lips lowered to
the ground.
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