King Lizard Robot is modeled after Australian Frilled Lizards. When these lizards are surprised or threatened they exhibit a pretty spectacular display. First it's the wide open, hissing mouth with sharp little canine teeth. Then comes the big reveal, the neck frills jump from limp to frightening in a snap. This aggressive behavior is truly a bluff and if you don't run away, the lizard will. Details:Modeled after Australian Frilled LizardsThe King Lizard Robot functions with two AI modesRequires 4 AAA batteries (not included)For ages 10 and up