True, the one in the picture is predominantly striped. Still, the same basic principle. Broken bands, spots, whatever. Penny is yellow alright, but very dark brown, nearly black. She has great face markings.

My favorite ones (least common and hard to find where I was collecting) are the chocolate/yellow colored banded variety, much lighter brown and deeper yellow. In the area where I was finding them, chocolate and yellow striped, broken bands ("zippered" pattern) and/or spotted like penny were just as common as normals.

Anyway, about the feeding, I suspect habitat to be a factor in their preference too. I always found them in deep canyons or the steep walls of the canyons, with a sage scrub/desert mixed habitat where lizards were the most abundant food. I returned to one of these canyons (fragments of habitat in an urban area) after being gone 10 years and it was so overgrown, choked with vegetation, I didn't find a single lizard or kingsnake.