guff - Yea, ya almost gotta know, to look. For me it was just plain good fortune. To show you how rare it is to see/find them I offer the follow up anecdote. When I got home and looked up and identified conclusively what I found, I then called the Ohio Department of Natural Resources office responsible for that geographic area. I emailed them the pictures and talked to a person there who said that he grew up as a kid along that very creek and in his youth he'd never seen them there. Not even once! The key is knowing: When - April for the latitude of Southern OH Where - in the glassy area at the head of riffles How - look for the lighter colored 15 20 inch cleared circular area on the creek bottom. Reminds me now, of how when I used to fish, I'd use polarized glasses to look for bass spawning beds. One last one -- they were so lacking in fear, that I was able to get real close. Too close. As I experimented getting the camera closer, at one point I found I had dipped the camera lens into the clear water!