Sometimes Done Right, Sometimes Not

We have seen many a nest box in recent years at area parks and greenway trails.  Most of them have been disasters---for the birds.  I was pleasantly surprised to see huge improvements with boxes on one of our oldest town trails.  The boxes are reasonably proportioned and have ring predator guards, and are on posts instead of trees, say.  Not all of these boxes are well placed.  This one sat right underneath a tree limb that might well invite snake attacks, and the cone guard struck me as too low to thwart squirrels.  Overall, these are the best boxes I have seen in awhile and a sign that someone out there is doing some thinking!