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The Eastern grey squirrel lives mostly in oak trees that have a medium gray bark. In some cities, oak tree bark is darkening due to air pollution. This Eastern grey squirrel shows melanism, or the increase in black pigment in its fur.

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astauch
Is this a true or false question? If not, then what's the question you're trying to ask?
Rawrimadinosaur
The squirrel is adapting to its environment by increasing the black pigment in its fur to camouflage better into the trees.

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