Are you sure
That's not just a still from this film?
A mighty ancient croc that battled monster snakes has been named after the mythical creature of the deep that was nearly Gandalf the Grey’s downfall – the Balrog. Titanboa constricts Anthracosuchus balrogus croc Titanboa constricts Anthracosuchus balrogus croc (Credit: Smithsonian Channel) Just as the Balrog rose up from …
I think that movie, and Lake Placid, spoiled me as I'm utterly unimpressed by a 16 ft long 900 lb croc. When I read "monster croc" I was thinking there might be some 40 foot beast in prehistoric times. That would be a reasonable size considering how big some of the other megafauna used to be.
2000lbs would be nearer the mark, or have you found some obese merrikan saltie? Longest croc in captivity (read: 'not made up in tall tale') was 20ft 3in "Lolong", at 2300 lbs. And being well-fed & under-exercised (='captivity'), I struggle to believe 2 extra feet will double the weight.
E.g. a 7.5m Anaconda's preserved skin has been stretched to 10+m --- so you need either verified live measurements or a full skeleton; skin isn't that trustworthy and stories even less. I'm a bit mystified by the Titanoboa's measurements, at 12m & 1200kg --- heaviest extant snakes (green anacondas) reaching only about 100kg for 8m (pythons longer but skinnier), so upscaling that shape by 50% (weight x 1.5 x 1.5 x 1.5 for 3D = about 340kg) doesn't get you nearly there... The main scaling issue is that muscle force scales as second order (=diameter of muscles) while weight as third order, so you have insects on hair-thin legs but elephants on massive pillars. These muscles then all need massive organs to supply them, and these oversized organs need extra muscles (and internal strength/skeleton to keep them from being crushed) to support.
Long story short, if you're near the limits of what is physiologically possible to survive, you need to eat smaller prey to not cross the line (destroy yourself by sudden movements, e.g. when defending yourself) --- and you'd still be a sitting duck with your stomach full (which pythons often are).
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