But he thought squirrels were the worst as there were thousands upon thousands of them, the forest and woodlot alive with the furry devils—red, black, gray squirrels and he knew for a fact that two squirrels could make six, seven, even nine more squirrels every year and each of these was soon mature. He tried to work out how many squirrels one pair created over, say, ten years, but the sums became so large they frightened him. The earth might be carpeted with squirrels in his lifetime.