Space Geckos

The adorable games lizards played in zero gravity.  

On land, geckos tend to be your typical, no-nonsense lizard: the friskiest they might get is to try and sell you car insurance. In space, they get a bit more loose, seen here playing with a collar in microgravity. What brought on this particular behavior? Researchers studying the geckos hypothesize their cold-blooded physiology may play a role.