A popo appears as a writhing mass of thick tentacles of contrasting colors, usually comprising blue and orange. Despite being only a couple feet in diameter, one of these tentacle masses is remarkably aggressive. Although it is omnivorous, it will favor attacking and attempting to devour anything that moves too close. A popo has been known to restrain small animals or children, then use the acids expunged by its body to digest the restrained creature while it yet lives.