I recently acquired a pair of vents and just the other day one of them started calling. I'm hoping it's the same one that calls all the time(they look very much alike). The one that doesn't seem to call is a little bit more robust than the caller. I'm hoping like heck it's a female. Is there any real other clue? One time after the for-sure male was calling I noticed they were both on the same leaf. Is there any kind of courtship displayed? The non-caller usually isn't fazed by the other one when he calls. Any help would be greatly appreciated.