u/MfD2027

Would you ever get this close?

Haole Girl is an equally formidable-sized female associated with these pictures, boasting similar dimensions of ~6m (19-20 ft) 2-2.26 tonnes (5000 lbs).

She has been spotted again since Jan 2019, (Oahu Hawaii).
Once in 2024, and This year! (2026), she is still alive, and still just as massive- chasing a Bluefin Tuna or a Marlin under a large ship!

[Rant] essentially the largest male killer whale is just inflated “Soviet whaling fleet” yikadee from the era of 25-30 foot white shark tales, 30 foot anacondas/pythons, 25 foot crocodiles and 24 foot tiger sharks (Reasonably large speculative sizes that were debunked in the 90s- early 2010s), as there is simply no way, as of 2026 that orcas are just magically the only animal "reliably" hitting 30 ft. the only reason this 22000 lb 32 foot male orca factoid still exist is because wide-spread "orca vs great white" ceteacen bias brings no incentive to correct overblown large bull/male toothed whale stats…
In facts:
AI overview will go as far as to say that not only does this not appease the rigorous measurements and verification process, but this specimen likely never existed outside of imagination and hearsay…

Issue: THIS has lead to people getting killer whale sizes COMPLETELY overblown, you will hear people citing bull averages upwards of 28 to THIRTY THREE FEET (A number cited in 0 formal literature) while citing 8-10 TONNES with a straight face… when true Type A Bull killer whales average 3-5 tonnes (females 2-4 tonnes).

Even legendary snake sizes have been corrected yet somehow killer whales (pretty significant to marine biology) are immune to the rigidity of science, thus definitely a debate killer whenever someone brings Orcas up as they have become the face of most modern marine predator enthusiasts and pretentious “experts”.

We’ve assessed the maximum sizes for each respective animal accurate for creatures like “deep blue” as massive 21-foot (~6.4m), and 5580 lb (2530 kg) female white shark.
We’ve assessed maximum sizes for crocodiles that were recently living, such as lolong the salt water crocodile, who measured 20-foot flat (6.1m) and weighed 2130 lbs (970 kg)
We’ve assessed maximum sizes for anacondas even… tall tales of a 15-18 ft average snake getting to 25-35’ (sounds exactly like JAWS & great whites)
When in reality, a large anaconda designated the name “Ana Julia” was the official verified world record holder for largest green anaconda scientifically and rigorously measured, not a 25 or 30 or 33 foot specimen… “Ana” measured in at 440 lbs and 20.7 feet (6.1m) heaviest snake on earth.
A 32 foot 22000 lb bull orca is about as likely/plausible as a 26 foot 13000 lb Great white.
A square cubed metric for white sharks of up to 4-5 tons simulated 25 feet as a hypothetical modern day max for white sharks, while 32-33 foot sizes were achieved by Pliocene deposits and fossil teeth of large Carcharadon carcharias members (Largest white sharks achieved 6+ tonnes in weight, legitimate to fossil record).
It is highly unlikely that this figure is anything short of fabricated and is likely not supported even anecdotally, no matter how many Soviet whaling fleet stories you hear
(Same excuse was made for an allegedly 24 meter sperm whale, debunked at 20.7 meters with more valid estimates, so while it wasn’t the full size, stated, at least it was the largest and actually existed)

Some level of maturity needs to reached regarding these animals true size… the implications that people make of a dolphin being T-Rex weight on average has gone from “understandable, yet false” to blatantly, obnoxiously and annoyingly wrong at times. It’s worse than the 37’ footer of port fairy that was always SORE THUMB wrong.

EDIT: formula for weight is square cubed law
15.9 meters = 61560 kg = 15.9m -> 22.86m = 191420 kg. Or 191 tonnes ignoring biology, and simply tooth scaling, but 168 tonnes is considered plausible.

(The 50 to 70-Tonne Consensus: Most traditional, scientifically accepted estimates place the maximum weight of a massive Megalodon between 50 and 70 tonnes. [1]
The 100 to 127-Tonne Extrapolations: Using 3D body mass models derived from the vertebral column of a preserved specimen, some prominent paleontologists pushed the maximum weight to about 104 to 127 tonnes. [1, 2, 3]
The 168-Tonne (and larger) Upper Bounds: At the very top end of the scientific literature, some extrapolations using geometric scaling suggest that an exceptionally large, 80-foot Megalodon could theoretically push past 150 to nearly 170 tonnes. [1, 2, 3]

How It Compares
To put a 168-tonne prehistoric apex predator into perspective:
Great White Shark: Modern great whites max out at roughly 2 to 3.5 tonnes. A 168-tonne Megalodonwould be roughly 48 times heavier than the largest great white. [1]
Modern Whales: 168 tonnes is comparable in mass to an average adult Fin Whale or a medium-sized Blue Whale, putting this ancient shark on par with the largest mammals ever to evolve.

A 168-tonne Megalodon (Otodus megalodon) is a plausible, although extreme, estimate for the largest possible specimens. Mainstream paleontology suggests maximum sizes of 50 to 100 tonnes, but recent 3D modeling and broader interpretations of the fossil record have pushed the upper boundaries significantly higher. [1, 2, 3, 4, 5])

Original post:
Tosha Hollman, reconstructed Livyatan using the proportions of Brygmophyseter, a more complete killer sperm whale that has been found to be close to Livyatan in recent studies. Using this animal as a base gives a length of 12.4 meters, far short of the commonly cited 16-17 meter length previously regarded in “lambert et al. 2010” whom slightly exaggerated Acrophyseter’s head:body ratio even based on contemporary data of the time. At 16-17 meters, L. Melville would’ve had a disporportionately small head, which contradicts the trend for predatory physeteroids to have rather larger heads for ram power and biting muscles. This, combined with the recent research that suggested Livyatan was not hunting the same prey as Megalodon, suggesting Megalodon may have been the true "macropedator" of the Mio-Pliocene, with Livyatan hunting large fish and small whales in polar waters.

Acrophyseter, Brygmophyseter, and Zygophyseter all have head-to-body length ratios between roughly 1:4 and 1:5 at most. Based on scientific analysis of skeletal reconstructions, Zygophyseter may even have a smaller ratio, around 1:3.2 to 1:4 depending on the reconstruction. If this scaling is applied directly, Livyatan would have a maximum TL estimate between 12-14 meters assuming a 3-meter skull. Even 15 meter would be generous here…

17.5 m size estimate for Livyatan melvillei is still considered mathematically possible, but it is widely regarded by modern paleontologists as an absolute maximum, with the average adult size being considerably smaller…
At maximum size, victory goes to Otodus Megalodon by an enormous margin.
Megalodon was the most fearsome apex hyper-predator in all of history, with seemingly no close runner ups, and filled a niche untouchable by any creature before or after it… It could only exist in high competition, high energy, high yield biodiverse ecosystems such as the ones from the Miocene. Megalodon made the early-mid Cenozoic reminiscent of the earlier middle-late Mesozoic era with high trophic level predation and had almost no miocenian competitors. The only other hyper-apex predator to rival Meg in sheer predatory intensity was sachicasaurus vitae in the early Cretaceous (~100 million years prior). This shark had highest most catastrophic bite unrivaled by any other apex predator before or after it. Holding the second largest teeth behind its contemporary, Livyatan…
O. Megaldoon was a heavyweight kaiju-esque apex hyper-predator completely head and shoulders above any toothed creature in sheer length OR tonnage (aside from gargantuan fragmentary icthyosaurs? Hardly debatable).
It went extinct, likely due to having metabolic needs that aren’t of this time anymore, and are only rivaled by blue whales in sheer energy requirements, which would never be seen in any other macro-predator in all of earths history…
A 15.9m, 61,560 kg (average female Meg) would primarily prey on medium to large baleen whales eating their energy dense fat.
An approximately 52-foot (15.9m) individual would have a stomach volume of 10,000 L, (88-90 million calories of energy dense whale fat) so while it would (HARD) PROBABLY be able to survive off 100,000 calories daily, feeding habits and bulk really suggest their daily sustenance was closer to 3.5-5.5 million calories. 100 000 calories is a hard to believe, dubious placeholder number rivaled by binging grizzly bears…
Considering animals DO binge eat, a binging megalodon for whatever reason, be it during significant growth or pregnancy (2-4 pups, at 7-13 feet 1000+ lbs). A shark carrying an African elephant sized litter would consume well over 100 million calories.
A 20.3m individual (~67 ft) would’ve been capable to eat twice as much, 20000 L of whale blubber, put into calories, equaling roughly ~150 million kcal. These numbers would’ve been much lower not involving these factors likely between 100 000-10 000 000 calories sutenance. Keeping in mind megalodon had large size variation.

AI overview: Yes, a great white shark can easily consume 300,000 calories in a single feeding.

Natural History Magazine
+1
A single adult great white weighs around 2,750 pounds. When they scavenge a whale carcass, they target the dense, calorie-heavy blubber.
(A 21 foot, 5,500 lb shark named deep blue was seen gorging a sperm whale in 2019, assuming a binge of 600,000 calories).
Thus overall average of 10.5 meters in the species had ranges of 100 thousand - 10 million calories sustenance for 18-20+ meter large individuals, and could theoretically binge 90-150 million calories in a day for maximal sized females.
And honestly, the most realistic explanation is that Meg’s feeding habits were never even properly studied, with 100 000 calories just being a placeholder number that megalodon would surpass and devour in less than a quarter bite and much less an entire day.
L. Melville is too devoid of any modern data for any consensus to be made on metabolic requirements, megalodon’s was rather just understudied and tossed up.

The largest, most formidable predator in all of earths history runs a gauntlet in every era of the Mesozoic, does it clear?

Bonus: How many Mosasaurus would you estimate to comfortably defeat it?