A beautiful example of Colorado's yellow headed collared lizard, 
Crotaphytus collaris auriceps, photographed by Michael Dunkelberger.

A yearling eastern collared lizard, Crotaphytus collaris collaris, 
photographed in Edmond, Oklahoma by Dr. Robert Sprackland.

Adult male eastern collared lizard photographed 
in Chapman, Kansas by Dr. Robert Sprackland.