Me either as I think Theo and Bruce are on the money. Plus even if effective you would need a lot of decoys to suppress all those little males trying to act big. An all male pond would be a better option.

But it is a good question as it makes us think about why BG act as they do and justify or reasons. There are no bad questions on this forum only ones that need to be answered after some thought about the subject !!! \:\) Questions are the life blood of this forum -- so please ask them - all of them and often.