Abstract: An ultrasonic whistle apparatus for mounting on a vehicle to warn animals of the approach of the vehicle is disclosed, comprising (a) a funnel to direct air into the apparatus and having an air path therein, (b) an ultrasonic whistle mounted in the air path in the funnel and adapted to be actuated by air passing therethrough, (c) a base for mounting the apparatus to a vehicle, and (d) an adjustment mechanism connecting the funnel to the base including a ball and socket joint for adjusting the direction in which the funnel is oriented, the funnel adjustable in more than one plane of adjustment.