4fo is big that would be a male the argentinas tegus get the biggest but are the best 1s black and white argentina's are the most tame 1s i hear reds are more agressive but i had the choice between a red and black and white i chose another black and white. but ya i agree w the iggy thin i thats how i got started in reps is my 1st iggy i realy had no idea ad it actualy bother me that peep are making th smae choice i did 2 years ago gettin in the same thing w no info i know everythin i need now but i need it before i git the iggy i have a great book on iggys its 650 pg everythinud ever need to know lol tegus i have found are the most gental tame and smart reptile so far but they do grow quick w the proper care w does variy between the kind og tegu u get there are also blue and gold tegu's some get mice and bugs fish and othersn need veggies too but when there closer to adult age lol sry i ran on!