yep it is a mock rattler. does it well too. we had them wild all over the place growing up. I have never seen one in a petstore because they don't sell very well at all. they can get big. i would check them out. they have cool morphs like i said earlier and are fairly inexpensive. AND THEY DON'T JUST SLUG AROUND....WHAT A CONCEPT. i mean don't get me wrong I love my bp's, they just do a lot of sitting.