Monitor (Varanus albigularis albigularis)

Sometimes when we called something and Gavin stopped and backed up, we'd get there and whatever we'd seen would be gone. But this Tree monitor gave us a good long viewing as he slowly made his way around and down the old tree trunk, hunting for insects. That gave me time to zoom in for a close-up and out to get the whole beast - about a meter long, would be my guess.