Canada Geese (Branta canadensis) take off from a small pond at dusk with the lead goose flying in front of the formation. The lead goose expends the most energy because it is the first to break up the flow of air that provides additional lift for all of the geese who follow behind the leader. When the lead goose gets tired, it drops out of the front position and moves to the rear of the formation where the resistance is lightest and another goose moves into the leadership position.