The loose folds of skin on Chuckwallas (at neck and sides) enable them to climb into a small crevice on a rock face. Chuckwallas can modulate their color chuckwallas are capable of autotomy, so they can break off and re-grow a tail, if necessary, to evade predation. Chuckwallas' teeth grow in grooves inside their mouth. If they lose one, they will re grow one to replace it.