Shelby, you must have BTS confused with aanother lizard as they are a great beginer lizard that does get much larger than 18" as a adult. I bet your thinken Blue tegu. Blue toungues are a awsome lizard. I keep 1 Gigas BTS he is the best a real treat to hold and will normaly come right up to the glass when I enter the room if he is up and out. One thing with BTS you really need to suck up and pay the extra cash and get a TRUE captive born and bred one not a import.