added to what Hunter0704 says...they will not only know where to EAT and Drink but they will also know where to lay their EGGS!!!!! :O)
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We have used chicken wire and have had zero problems even out in the country with a known presence of raccoons and foxes around. I am of your same mindset--first sign of an issue we'll change things. Until then, don't fix what ain't broke. (PS only 2 birds we ever lost to predators were lost broad daylight while free ranging. One had evidence of a bloody fight, one just never came home to roost one day)