Abstract: A method of deterring to waterfowl trespass onto a real estate property, particularly a property bordering onto a body of water inhabited by geese, and an effective barrier for doing so, is disclosed. The barrier consists in its simplest form as a pair of lines suspended above a property surface, one line at 3 to 10 inches high, a second line at 8 to 30 inches high, with a separation between lines of at least 5 inches. The lines are suspended by means of an array of posts. Preferably, a dispenser for feeding a line from a spool and also for retracting the line is mounted on one of the posts. The barrier is optimally removable, including means for retracting the line and for conveniently removing the posts from receptacles in the property surface. Thus, a property owner or user is allowed full recreational access to the property without the problem of goose droppings on the protected property.