Maybe this is normal but i have never seen it before. Awhile back i posted about how my Grey tree frogs likes to hang out in the waterfall for hours,still does this. Something new now. i could not find him anywhere in the tank(this has happened before also. But i was determined to find him this time),never thought to look on the bottom of the tank fully underwater.He blended in with the rocks and almost didn't see him. There he was he looked dead, i went in to retrieve him and to my surprise he was alive. Took him out put him on land and he when right back underwater and came out after some time?Yes he is a Grey tree frog from CT. I posted pics to confirm. Is this some type of weird hibernation since it is getting cooler(tank is at in house room temp around 60 Deg). I would think he would do this on land. Has anyone seen this before or know why he does this?