After a very slow start this spring, populations of some butterflies are booming at places. Today (7/1/13) I did a count at the Zim Wildlife Refuge. There seemed to be a population explosion of silver-bordered fritillaries, in particular. I discontinued counting them at 85. There were hundreds, maybe thousands. Had I continued counting fritillaries, and northern crescents, I would have been stuck in a small area for a very long time. I decided to stop counting them and just look for other stuff. I have had similar experiences in the Zim refuge. The Zim refuge is well known among bird watchers but should be equally well known to butterfly watchers! A particularly good spot is the northern parking area on the east side of County Road 7 (at 47.22596d north, 92.60096d west). I can not recommend this locality enough!