What the hell are they??? Part 2

I dunno if ya’ll remember a brief posting back in October of 2004 in which I posted an unusual (or what I thought was unusual) pair of pictures of odd looking wooden structures in the middle of a field in a state park in NJ (“what the hell are they???” or something like that). Well, thanks to my old friend Barb, it seems we have an answer (nice to hear from you after all these years too, Barb). Those things are apparently butterfly houses, if one can imagine. I had no idea butterflies desired to own property. And where’s the central air in these joints?