Gray Squirrels of the 19th Century American Northwest
After the American Revolution, citizens of the new United States moved north of the Ohio River into the Northwest. They saw many gray creatures known scientifically as sciurus carolinensis. Farmers soon discovered that squirrels were their new enemy. Squirrels ate freshly planted seeds and crops. Naturalists studied these squirrel migrations; their theories of these mass movements ranged from the depletion of food sources to insect infestations of their nests to simple desires for new living spaces.