Garstin Trail, Palm Springs, Coachella Valley, Riverside County, California
Group of 11 rams crossed trail and went up mountainside.
The common chuckwalla (Saueomalus Ater) family Iguanadae. Black and whitish(yellowish) pattern, large lizard, they swallow air air to puff up and look bigger. I found this chuckwalla in a trial at Palm Springs.