i've spent a countless hours searching for all sorts of reptiles in the wild (and my old truancy officer will back me up), and i have only come across one land mullet and that was after a bush fire, i picked him up and he was hissing mad he had a big burn on his side.
would have been easy 60cm long, i looked after him for a couple of weeks then took him back to the river bank and let him go in all the Privet bush.