I've heard this sound 3 days in a row, all responding to me clapping. It was heard in tall grass / reeds that grow along side a mouth of the Pilgrim River where it joins the Houghton Canal in Michigan's Keweenaw Peninsula. I think it might be a Sora, but I'm not 100% sold on it so I would like your opinions. Location: Houghton, MI Date: September 15th (and previous 3 days)