I've got a ton of M. septendecim in my back yard right now. This is the first time I've heard this kind of call and it was definitely kind of creepy at first. A few get on my house in the middle of the night and then you can hear a single individual call. I thought it was a person outside, crying in pain, at first.

One thing nobody talks about is the stink that starts to develop about two weeks after they first start emerging. My backyard is disgusting with decaying cicada bodies. We even had a pretty long rain over the weekend and it's still pretty unbarable out there.