[NonValueAdded]

From what size predator, would a wooly mammoth have needed to evolve an ability to hide?

From that largest and most voracious of all predators, global cooling. Those with the lighter fur did better at the glacier edge while the darker furred animals roamed in warmer climes. /total conjecture

[patton]

Actually, you amy be onto something. It is no accident that the color of one's skin is inversely proportional to the distance one's ancestors lived from the equator.