A Stich in Time Saves Nine
Squirrels, after birds, are by far the most difficult subjects to shoot. They are extremely alert and highly sensitive to motion. One wrong move and you could have a dangerously stimulated squirrel pouncing at you and running haywire.
Unlike their look-alikes, the rabbits, squirrels are also highly claustrophobic. Put them in an enclosed cage and stick your finger in, and you'll see what I mean.