I would say monitors, but i have never been around a crocodilian long enough to know how smart they are. And iguanas are fairly smart too. I guess its a pretty tough choice.interesting thread though.
Pete and Jess share their home with -
0.1 Suriname Redtail Boa,1.1 Brazilian Rainbow Boas, 1.0 Ball Python, 1.0 Savannah Monitor, 2.2 Bearded Dragons, 0.1 Veiled Chameleon, 0.1 Leopard Gecko, 0.1 Smooth sided toad.