Herons are very intelligent, my neighbour found that when she had a model heron (which looked quite realistic), she had to move it around or the real heron soon realised it was not real! Eventually it got the idea that this heron was there just too much of the time, and got all the fish anyway! They now have a rather nice bog garden and no fish - but we all have plenty of fros from my other neighbours garden pond - in which they do not try to keep fish.
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Herons are very intelligent, my neighbour found that when she had a model heron (which looked quite realistic), she had to move it around or the real heron soon realised it was not real! Eventually it got the idea that this heron was there just too much of the time, and got all the fish anyway! They now have a rather nice bog garden and no fish - but we all have plenty of fros from my other neighbours garden pond - in which they do not try to keep fish.