I have heard that they should only be put in the pond when the herons are looking to
establish territory. The theory is that they will see the "heron" in the pond and pass on by. Is this true or should I put it in the pond and maybe save a few fish? If it is the absolute wrong time, he will figure it out and never pay any attention to it again.
Please advise me. I don't even know if there are any fish left!