VAR UNDERWATER in Yellowstone River showing CU/MCU of caddis fly larva in shell covered with "debris", scraping food off of rock. MCU SA of mayfly nymph scraping food off of rock on river floor. Cut back to caddis fly larva. VAR CU of frog lying/swimming in Yellowstone River, surfacing several times, only eyes above water. (some nice shots of all three subjects, separately). (42241)