There's a Komodo Dragon in your garden

Being British, I'm not used to seeing lizards just running around in my garden. However after 6 years of living in SoCal, I have got more used to them.
My parents recently visited and after a trip to the zoo, my dad came into the house and told me I had a Komodo Dragon in my garden.
It is a pretty big lizard although not a Komodo by a long shot! He seems happy enough living under a rock near our front door.