Quote:
Originally Posted by tomcat
You can avoid birds entering your boxes by using wire mesh on the back which they can feed on the bait through, plus cover the box entrance with an evergreen branch. The birds won't go thru the branch yet the marten and fisher will not be deterred.
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I find longer boxes like these helps as well. I have also used the evergreen branches. I usually have done well and not got more than a couple birds a year.