I have 4 of them and have yet to hear or see them calling. I would definately be interested in hearing the call and seeing the video. These guys are pretty cool
::A few days ago this M. stelzneri called all day. Here's a pic I quickly captured. I also got some very interesting video of the interaction between it and a female, but am still working on ways to post it. I am also working on extracting just the audio. Great call!