http://en.wikipedia.org/wiki/Mammal
Color Variation in Mammals This hair, also known as pelage, can vary in color between populations, organisms within a population, and even on the individual organism. Light-dark color variation is common in the mammalian taxa. Sometimes, this color variation is determined by age variation, however, in other cases, it is determined by other factors Selective pressures, such as ecological interactions with other populations or environmental conditions, often lead to the variation in mammalian coloration.These selective pressures favor certain colors in order to increase survival.
Color Variation in Mammals This hair, also known as pelage, can vary in color between populations, organisms within a population, and even on the individual organism. Light-dark color variation is common in the mammalian taxa. Sometimes, this color variation is determined by age variation, however, in other cases, it is determined by other factors Selective pressures, such as ecological interactions with other populations or environmental conditions, often lead to the variation in mammalian coloration.These selective pressures favor certain colors in order to increase survival.
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