Welcome to The Forum, both of you!!

P-mommy, what you want is a deterrent, I can think of 2. 1) a plastic owl 'perched' overlooking the pool or one of those 'crazy waving arms men' that you sometimes see to attract customers to a car dealership or restaurant. 2) If possible, string some fishing line (cris-crossed ~ 10' above and around the pool area - the 'sparkle' of the monofilament deters them).

As a last resort, a shotgun would solve the problem