Abstract: A birdfeeder according to the invention is designed for repelling predatory animals. The feeder includes a spring-actuated roof which acts as a catapult when an animal alights thereon. The roof is secured by a latch which disengages when spring loaded pistons urge the roof upward and it can be closed and resecured either manually or automatically by motor.

Abstract: A golf tee providing adherance of the golf ball to the holding surface of the tee by means of at least a partial vacuum created under the ball, whereby the restrained or, in effect, heavier ball has greater resistance when struck by the golf club and travels a greater distance because of increased elastic reaction of the ball to the club. The tee includes a hollow housing, the housing being provided with an aperture in its upper surface to sealingly support a golf ball. The inner portion of the housing is provided with a piston which creates a vacuum in the housing when moved downward in the housing while the golf ball is positioned over the aperture. A lever arm is pivotally connected to the housing and piston to facilitate movement of the piston upward and downward in the housing.