Protect your pond fish from heron attacks with the Heron Stop Spinner. The eyes of a bird of prey and the light reflection of the metal deter unwanted birds.Properties of the Heron Stop Spinner:Effective protection against heron attacks. Inspired by rocket launches. Can also be used on balconies. Decorative element. The Heron Stop Spinner uses the principle of birds of prey eyes and light reflection to ward off herons and other birds. Place the spinner by the pond to trigger an escape reaction and prevent herons from attacking your fish. The spinner is also effective on balconies to scare away pigeons. Increase the effect by placing several spinners in larger ponds.