As winter approaches, the tufted titmouse harvests the last berries of the season and transitions from a summer diet of primarily insects to a winter diet of primarily seeds. Common visitors to backyard birdfeeders, tufted titmice prefer sunflower seeds. They tend to choose one large seed and fly to a nearby branch, where they hold it between their feet and crack off the shell with their beak. Often, rather than eating it, they’ll then fly a short distance and stash it for later.