They can get to weigh a lot more then that, providing they are males. The heaviest wild female ever caught was about 60 lbs. They can and will escape - we had one in a horse trough about 3.5 feet tall, and it had no problem clambering over the top on several occassions. However, if you are getting a hatchling, you are looking at ten to twenty years before they even get to weigh near 40 or 50 pounds. I have a 1-2 year old right now that barely weighs a pound, and I plan on being dead before it gets to be too big for a well-designed outdoor enclosure. I figure my children will deserve trying to figure out how to house it, after they drive me crazy growing up.
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