they are actually called sperm plugs and when left on items in the cage they become a sperm deposit! They come out of your male chameleon's vent often times when they poop. They usually try and get rid of them by rubbing them off on a branch or vine and that is where you will usually find them. You may every so often see one sticking out of the vent. It kinda looks like a yellowish worm. As long as it is not moving, then it is a sperm plug so don't freak out! lol