We have them down here too. Never realized they changed color also till I started messing with them. Cool little guys...
dryfly,
yours appears to be a roundtail horned lizard from what I can see in your pics.
Anyone interested, there's a decent book or two by Wade C. Sherbrooke.
2003 version
1981 version that I have:
loads of info on the critters.
Pretty cool, thanks. 👍🏻
Don’t know much about them except I had one bought at a pet shop for a time when I was kid. Always thought they were cool. I think I used to feed him meal worms and crickets but I was maybe seven or eight at the time so don’t recall much about it. Could be misremembering it’s for the turtle and toad I also had. Always been fascinated by critters. I’ll check it out.