Chipmunk....

....with it's cheeks filled to the brim! I watched this one & it's buddy for the longest time! They'd jump up onto the neighbor's storage container, wait for the birds to get off the feeder, & then they'd leap up onto the feeder, fill up with seeds, leap down, run to wherever they're stashing the seeds & dump them, then run back to repeat the process. At this rate they'll be totally set for the winter! :)