facts i know
A squirrel will break the shell of a nut with its teeth, then clean the nut by licking it or rubbing on its face before it is buried. This action applies a scent to the nut which helps the squirrel find it later, even under a foot of snow.
The sweat glands of a tree squirrel are located on their feet, between the foot pads and on their paws between the toes. When hot or excited a squirrel will leave wet tracks on a dry surface. This scent is also used to mark the trees in their territory.