Well, you have your eastern squirrels and your western squirrels. Eastern gray squirrels go into automatic evasive mode, and think constant change is good and most practical. Western squirrels are much more conservative and resist all change. I met a western squirrel at Yosemite Natl Park, and he was stock still in the middle of the road. After stopping and waiting awhile and being more accustomed to eastern squirrels, I decided that if I proceeded slowly in my car, the squirrel would go into his broken run pattern. At a crawl, you know that squirrel did not budge to the point of death. Now I know that these behaviors are all instinctive and I believe there is little thought that goes into the behaviors when in a life threatening situation. I guess the verdict is out as to the natural selection of squirrels over time as to which is the better tactic. I think eastern squirrels have a 50-50 chance of running right into a collision course with destiny, and western squirrels meet their maker only if they happen to be in line with the tires.