Deer eat my Iris flowers then spit them out because they taste bad. Still, I lose the blossoms. Cats think the Iris patch is a forest, and break off the fans as they blunder through. So, I bought a Bell & Howell Animal Repeller. The frequency is too high for humans to hear, but it scares the animals. It gets charged from sunlight and is set of by movement within 30 feet. David E. Redwood City (S.F. Peninsula) CA