Let's hope it is local. But, while I haven't done any formal surveys, I've noticed similar trends near my home in central Illinois. Not many frogs, the bats seem to be doing fine, but not nearly the number/diversity of butterflies as last year. I was just wondering to a co-worker what happened to the barn swallows this year. None at my place. And then a week and half later, they showed up in force...sitting pretty as could be on the power line to the house.