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Our street is 8 large blocks long. We had black squirrels only in the first two blocks, then fox squirrels only in the next two blocks and the gray squirrels occupying the next four blocks. Now, the black squirrels occupy the first four blocks with very few red squirrels around. And, the gray squirrels still own the last four blocks. It is a uniquely segregated neighborhood.
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My high school biology class did a census in 1991-1993 to illustrate different sampling techniques. I no longer have the data, but it did show mostly fox squirrels at that time. The niche is now filled almost exclusively by grays. The fox is almost a rarety in Palatine.
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We had only fox squirrels until approx. 6 years ago, now the greys outnumber the fox 3:1.
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