Your cages are awesome, roo!
I have seen the brevs play dead. One evening, I walked by the cage and accidentally bumped it.The brev was on the screen and immediately fell to the ground looking like a curled up dead leaf. When I picked him up to see if he was alive, he never moved, never breathed, and I would have sworn he was dead. No matter how much I moved him around looking at him from different angles, there was no sign of life. I laid his tiny "body" back down on the floor of the cage to see if he would move or not. He didn't. I came back about 15 minutes later and he was gone from where I had left him. I was so relieved!
I also had brookesia thieli play dead on me. The tiny chameleon went stiff....legs still in the position they were when I startled it...no movement, no breathing. This one stayed like that for over an hour. These ones also vibrate when picked up.
Many chameleons produce a sort of buzzing when picked up...
* B. decaryi (E. Edwards)
* B. thieli (E. Edwards; L. Horgan)
* C. dilepis (K. Barnett)
* C. Johnstoni (F. LeBerre)
* C. melleri (A. Banks)
* C. Oweni (F. LeBerre)
* C. senegalensis (K. Barnett)
* F. ousteleti (multiple ADCHAM list members)
* F. pardalis (multiple ADCHAM list members)
* R. brachyurus (J. Mease)
* R. brevicaudatus (J. Mease)
* R. kerstenii robecchii (E. Edwards; J. Mease)
* R. uluguruensis (J. Mease)
http://adcham.com/html/taxonomy/species/chcalyptratus.html
Go to this site to hear what it sounds like in the veileds...
http://www.geocities.com/RainForest/Vines/5014/hoot.html
Vibrations...
R. boulengeri...
http://www.calacademy.org/research/herpetology/frogs/frogsimp/reptiles/e6.htm
"Many of the specimens produced buzzing vibrations when collected."
Playing dead...
http://photos.wildmadagascar.org/images/brookesia10290052.shtml
R. temporalis in a state of akinesia...
http://www.crestedlady.com/temporalisakinesia53106.jpg
http://www.crestedlady.com/pygmycaresheet.htm