They're Bearded Dragons - Pogona vitticeps
Both were photographed in the mallee about 20 km south of Robinvale in Victoria.
It was a 39 degree day FYI, lovely day for fieldwork.
Attached is a Sand Monitor - Varanus gouldii
Its all I got ATM that isn't a bloody mallee tree, I never have a camera handy when I see exciting stuff like a 2.7 mulga snake crossing the Pooncarie Road, NSW the other day on the way to another job. It was as big as a decent sized python, and very angry.
Cool bugs though, getting back on topic. I'll dig up some some photos of ants if I can find them.