underside of a male chuckwalla lizard (sauromalus ater) on rock

chuckwallas chuck chuckawalla chuckawallas sauromalus ater obesus iguanidae iguanid fauna reptiles reptile lizards lizard zoology biology animal desert deserts desert animals wild herp herps herping herpetofauna herpetology reptilian reptilia squamata wildlife wild nature creature outdoor wilderness scale scales scaly bask basking