You guys know that the chances of everyone here knowing the difference between a redtail (columbian) boa and a mexican boa are slim to none. The fact is , that unless you eat, sleep, and breath snakes, you probally don't know the difference between snowballs and your ass. There are a bunch of different types of boas from Central and South America and they all look verry very similar. As a matter of fact you can't tell the difference from some unless you count the belly scales. So just to clear that up. Theres to many boas called redtailed boas. Some reach 4', others reach 15' or more. So picking up the usual red tail boa from the pet store is not a good idea, especialy if you cant tell the difference from a hog island and a columbian. Any ways I'd say your best bet is a ball python. It still has that bulky big snake body in a small snake package.