Lol, now is not the time to ask 'how big will my Burmese get'. Like mentioned they get 11-16' and it is going to eat big stuff. Hope you are ready for rabbits lol. I would say a good start would be a 4x2 cage but by the end you will need something like a 8x3. A Burmese python is the wrong snake to impulse or blindly buy. Kind of like a retic.
For a size comparison, look at Mr Sully's avatar. That's his Burmese and the thing stretches from the floor to above the counter where a over the stove microwave is.
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