This was an incredibly rare thing to witness let alone be able to photograph well. After several days of attempts to photograph lizards in their natural habitat I just happened to be in the right place at the right time. Now, collared lizards are fairly easy to photograph/approach. If you move rather slowly or just sit and wait, they will let you get very close before fleeing unlike some smaller more wary lizards and then they just go a few feet away and stop again instead of diving for the nearest cover. I found them to be very easy to catch compared to say, fence lizards. Makes them incredibly easy to photograph due to their habit of staying in sight atop boulders.
This is a full grown male a great basin collard lizard, about a foot long (this is no tiny lizard) eating an adult mouse. Photo taken in March of 2011 just off of Sparks Blvd. in Sparks, NV. It was in the low 60's (F) with high clouds and hazy/weak sunshine and a rare day when the wind wasn't blowing. They tend to disappear when it's too windy. I just saw him out of the corner of my eye as he climbed a rock with his meal then he sat there perched just a few feet away, keeping one eye on me at all times. He was quite aware of my presence but didn't seem disturbed by it.