I'm just putting it our there, those that want to continue will, I'm not the Police.
Having birds and ducks around your yard is no indicator as they don't eat mice and rats - how many Owls are hanging around?  They frequent even heavily populated areas and a property like yours Shane, you should have some all the time - they are natural mousers themselves.  Most that live on any acreage will have some if they aren't poisoning their primary food source.  The inlaws have several on their property - not hard to spot or find if they are around. 
Have a good friend whos whole life is looking after, caring for and nursing Australian Raptors.  The Owl population is drastically lower in areas than it was even 20 years ago - most of the autopsies he has had done on dead owls (quite a lot as he is doing a research paper on this) have shown poisoning being the cause of death - randomly using large amounts of poison is proven to kill our native birds of prey.  
Just sayin' - those with a conscience may wish to change their habits is all.  His biggest allies in this area are School Children who he has classes with every week all around Melbourne.  Once they see how beautiful these creatures are and how they fit into the ecosystem and how easy it is to prevent their deaths through not knowing any better, they will almost always go home and make sure their parents know as well.
I'm not being a greeny here, I just love our native wildlife and if someone here learns this lesson (I was just as guilty up to a few years ago) then they we might have more of these awesome creatures around in the future.  I get that large mouse and rat populations are a problem and need dealing with, just maybe put a bit of thought around how and where you use poisons to control them. 

 
			
		
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