Memory
Squirrels bury nuts in order to have access to them later, a skill that’s not very helpful if they can’t remember where they hid them. Squirrels have shown they are capable of remembering where they have buried nuts. In study performed at Princeton University, grey squirrels were capable of using spatial memory to retrieve nut caches they had buried. They can remember good sources of food from year to year. Squirrels are also capable of memorizing the easiest route up a tree to get back and forth from their nests.
Deterring Thieves
If a squirrel comes across another squirrel’s cache of nuts, he’ll happily take them for himself. To deter would-be robbers, squirrels will rebury a cache of nuts over and over. Moving food around makes it harder for another squirrel to find the store. Squirrels will pretend to bury a nut if they know they are being watched and wait until they are alone to actually hide it. Being capable of actively deceiving another squirrel is a form of tactical deception, a skill once thought exclusive to primates