Yep,Here you go. http://bowsite.com/bowsite/features/armchair_biologist/acorns/acorns.html
Now remember, in theory, less of an acorn crop should have them moving MORE.
Year before last when the ground was covered at my place, there was notably less sightings.
During the heavy years, or any year pretty much, we try to find the first trees getting hit by the squirrels and we hunt them first. They are up in the top of them cutting acorns before they ever begin to drop. They give me an idea of which tree/s will be the sweet trees before the deer are ever in there feeding on them.