That's as cute as could be !! It's a uromastyx , looks like a young one. I've never seen a lizard do that, so I doubt if it's common.....they must have found out by accident that he likes to be tickled. I cracked up, and was amazed. :lol: There's a member here by the username Claudius [ Brandon ], he posts a lot and he owns some uromastyx. You might message him to see what he thinks.