We have two in a divided AP T8 - they BOTH do this. One of them (Recon) learned how to knock the light down and escape, so we took it apart and moved the lights back so they couldn't get up there anymore. (Until we had time to fix it, we left the light hanging with the escape route covered rather than worry about him hurting himself, and he just chilled on it like a GTP - he even ate on it. We have video. It was amusing.) Now they're constantly trying to figure out how to hang somewhere else - the smaller one (Houdini) will wedge himself between the dam and the glass doors or in the top corner between the light, tank side, and Accurite so he can hang. Houdini's been climbing things since the day we got him, so we'd expected it from him. Recon was the oddball. xD