If they were heading to shadow cliffs then they would have had to cross the street, and that would be suicide. The cars would not stop for them. At the end of Stanley there are a bunch of walnut trees with all the walnuts on the ground. They could have gone there.
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Based on this book they can eat a pound of acorns or nuts in a day so that may have been where they were going. Hopefully they dont get run over on the side of the road.