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In addition to being the world’s largest fish, megalodon may have been the largest marine predator that has ever lived. (Basilosaurids and pliosaurs may have been just as large.) Megalodon was an apex predator, or top carnivore, in the marine environments it inhabited (see also keystone species).
A blue whale can grow to up to five times the size of a megalodon. Blue whales reach a maximum length of 110 feet, which is far larger than even the biggest meg. Blue whales also weigh significantly more compared to the megalodon.
While one on one a megalodon is completely superior to an orca, the orca pod hunts and fights on cooperation. The orcas will simply ram the megalodon on gills and circulate around it on three dimensions. Orcas are far more agile than megalodons, and the fish needs to concentrate on several enemies at one time.
Most reconstructions show megalodon looking like an enormous great white shark. O. megalodon likely had a much shorter nose, or rostrum, when compared with the great white, with a flatter, almost squashed jaw. Like the blue shark, it also had extra-long pectoral fins to support its weight and size.
Defeating a Megalodon takes around 12-15 cannonball hits on a Sloop, around 15-18 cannonball hits on a Brigantine and around 30-32 cannonball hits on a Galleon. Sloops and Brigantines also take less damage from the Megalodon’s bites.
A pod of carnivorous whales, orca size (20–30 feet) or larger, could kill a megalodon. They include the 20 foot Aulophyseter, Zygophyseter and Brygmophyseter (a large enough pod would be dangerous prey for the megalodon) the 45–60 foot Livyatan, and the 50–70 foot Sperm Whale itself.
While a similar length, the Megalodon had a much more robust body and huge jaws built for devouring whales and other large marine mammals. A Mosasaurus would not have been able to get its jaws around the much thicker body of the Megalodon. It would just take one catastrophic bite for the Megalodon to end the battle.
When it comes to size, the blue whale dwarfs even the largest megalodon estimates. It’s believed blue whales can reach a maximum length of 110 feet (34 meters) and weigh up to 200 tons (400,000 pounds!).
Also the Kraken is much larger than most marine animals of that era. Also he is a mythical creature and there are many different forms and most are much larger than the Megalodon. The tentacles alone should be enough to take the Meg down with no problems.
The Mosasaur Size Chart says that Mosasaurus is the largest mosasaur (like how I think), and compared to the T-Rex size, Mosasaurus is definitely bigger than both I-Rex and T-Rex. I think that it reached 16-18 meters (That’s about 55-60 feet, bigger than Spinosaurus, I-Rex, and T-Rex.)