Memory:Master mimic

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 covered in glue, then it's a master mimic. Pray you live to tell your tale, 'cause master mimics are the best of their species at what they do.