In my opinion genes play as much a role on overall growth as environment and subsequent nutritional history or feeding regimen, if not more. Just because *some* burmese reach 20 to 25 feet over a lifetime by no means indicates that all burmese will reach 20 to 25 feet on average. These great sizes are extreme rarities and are an exception to the more average sizes normally reached by mature, well fed, healthy burmese. These huge sizes may be the result of genetic predispositions to grow huge and they may be due to malfunctioning or faulty growth glands.
Other, smaller burmese may come from a smaller line (gene pool) of burmese from a completely different regional origin. One never knows. It is like this with all diverse species that cover wide, geological areas. Look at the dwarf burms and dwarf retics surfacing the last decade.
Another case in point, my ceylonese females average 7 to 8 feet tops. Kelly Hallers average 11 to 12 feet. This is an enormous difference in eventual, overall size and I feed mine WELL.
In any event, the average lengths of most mature female burmese fall between 12 and 16 feet. A little less or a little more doesn't really mean much of anything if the specimen is healthy.
This is just my opinion on the subject.
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