Our friend Summer has been telling us about a waterfall near her house so today John and I joined her on a hike to it. The trail was so overgrown in places we feared stepping on venomous snakes and had to backtrack at one point. There were gorgeous spiderwebs with fat, striped spiders. A field of small, darting butterflies. And then a butterfly so large I said no, it’s a bird, as it partly disappeared into a tree. And John said no, it’s a bat, as we crept up to it and stared at the dark form. And Summer said no, …