I have a pond outside in my backyard, there are about 6 fish in my pond. i recently saw a blue herron outside about to eat one of my fish, how can u keep these birds away????? We used to have a heron come and fish out of our backyard pool which was converted into a pond. We would just come out and wave a broomstick at it and it left after a couple of times. Chicken wire over the pond will help too.