Pika are high alpine meadow dwellers who are members of the rabbit family and are about 4-5 inches long. They gather grasses which they RACE to their burrows to store for the winter. Did I say RACE?! They are so fast they easily beat any continuous focus attempts. I finally managed to catch this fellow in stride on one of his frantic runs.
Thanks for looking.
200-400mm lens with tc1.4 ISO 400, 1/640 at f7.1, handheld.