its funny when you first catch them.i never seen it happen before hand.i caught my baby bp doing it one night i thought she was having a seizure or something then i noticed a tube of skin slowly coming off.its amazing.next time you see them blue eyes or pink belly pay close attention to those sounds coming from your bps enclosure you might catch him and he might leave you a lil surprise in the skin or around it, a nice lil old stinky doodie.