Chipmunks are ground squirrels, usually they are not spotted in the trees.  This is the 2nd year that I have caught them in the trees after the same thing.  Cherries!  We have 2 cherry trees just off our deck and they have a huge temptation for these ground loving chipmunks

They are quite the acrobats up in the thin branches

If there was any doubt as to what they are after.  This is a delicacy for them