An incubator is an image you can post in signatures and various websites, showing your dragons and allowing people to click them. They are very widely used in the Dragon Cave forum, because it is against the rules to post your individual eggs (it causes spam and lag). The offical Dragon Cave incubator can be made for everybody's scroll, and looks like a piece of parchment with pictures of the user's dragons on it. Only one incubator may be generated per scroll per half hour. This option is available by clicking the "Generate Incubator" link at the top of a scroll.