Oh, you mean horny toads/horned lizards? (yes, that's what we called them) The little endangered species that can shoot blood out of its eyeballs and eats ants? Back where I grew up you weren't allowed to touch them, not because they were dangerous but because they were threatened. Growing up I remember being able to find them anywhere as a little kid but their being less and less as I grew older. Kinda sad, loved watching them eat those gigantic red ants (not fire ants, some other species). We bought a Rocky Mountain Horned lizard from the pet store once (a non-endangered species, captive-bred), but it died because the guys at the pet store had no idea what they were talking about when they said to feed him crickets, there's a type of acid that they get from ants that's necessary for their diet. Blah.
Anyway, back on topic slightly I still say that those chameleons are the coolest things ever, and I think it would be a worthy investment to buy one. Which I now intend to do some day alongside the Green Tree Python that I'm going to buy. Seriously the one named Slash has the most awesome color combo I've ever seen.
Edit: Nevermind
"The thorny devil is only distantly related to the morphologically similar North American horned lizards of the genus Phrynosoma, and is more an example of convergent evolution."