shes a roy and ms purdy female , and shes only 18 inches.... everyone elses seems much larger.... i offer her food everyday and she stopped eating about a week ago and before that she was only eating like every 3 or 4 days and only rodents it seemed.... i use to power sun 100 watt and basking spot is around 100 or so.... its a pretty big tank 75 gallon and i do everything i can to take good care of both tegus.... does 18 inches sound too small ? i know the answer to the question is all tegus grow different and at diff rates but i just wana make sure and here any ones opinion... angus is 21 inches but hes a male maybe that can explain the slight difference?