Protect your garden pond from unwelcome guests the heron defensive fence is an electric fence with three rows of strands in the heights 20 40 and 60 cm above the floor this type of heron defense does not interfere with the pond care and at the same time also helps against cats depending on the size and the covering through the green fiberglass piles and the green wicker fence the fence can be integrated unobtrusively at the pond edge the heron feels an unpleasant current pulse on contact a