I just went into my varadero tank to clean off the glass and I must have startled this one frog because he played dead! I picked him up with a leaf to see what the heck happened - I thought he had a heart attack - and I could see he was still breathing. I put him on a vine and he just hopped off and landed on the ground on his back and just sat there for a good 30-45 seconds. I could see his heart beating, so I knew he wasn't dead, but what the heck is this? Defense mechanism?