I've been hearing what I believe to be stridulation from my small G. lurida colony. At first, I thought that the noise may just be from the nearby crickets; however, they're all nymphs. After this last feeding, I'm now certain the noise has been emanating from the pile of oak leaves in the roach bin. I'm also certain that nothing but G.lurida reside within those leaves. The sound is not high like that of a cricket chirp; it is more of a low groan, and it is not all that repetitous. Please forgive me if this is common knowledge, but when I kept this species before, I don't remember hearing it. Can anyone confirm this observation? Thanks in advance!