Memory:Mimic hivemind

You know it's gonna be a bad day when a bottle of water beats you up. These predators have no natural shape, and the shape they do assume is always different -- and VERY convincing. How can you recognize them? Well, if that "inanimate" object in front of you suddenly has hundreds of nasty teeth and a couple of long, sticky arms with razor-sharp barbs covered in glue, then it's a mimic hivemind. Their antennae allegedly enable them to telepathically summon more of their ilk.