The document describes an observation of a male cat chasing a feather for 1-1.5 minutes before laying down panting. It explains that the cat's retina detected the moving feather which triggered a neurological process involving the thalamus, visual cortex, and central pattern generator to instinctively chase it. This used the cat's fast fatigable skeletal muscle fibers which became fatigued once glycogen ran out, causing it to stop chasing and pant.