It must be an instinct because an animal has to do these things before its first winter. A squirrel without its food supply (or fat, if it hibernates) will simply die.
Nowadays apes do watch T.V/computers and go crazy. Huge pet chimpanzee shot dead after mauling woman http://www.pantagraph.com/articles/2009/02/17/news/doc499a33764b43a165075661.txt
Link to Original Source