At a length of more than 50 feet (15 metres) and a mass of nearly 50 tons (tonnes), Megalodon was both larger and heavier than Tyrannosaurus rex.
They were much larger than Tyrannosaurus rex. Megalodons weighed up to 100 tons, while T-rex weighed a puny 9 tons.
The Megalodon weighs in at upwards of 50-70 tons, measuring a span of up to 60-70 feet in length. By contrast, the Blue Whale tips the scale at around 100-110 tons and tops lengths of up to 100 feet. Who Wins on Size? It's pretty obvious that the Blue Whale is the bigger apex predator in this fight.
Spinosaurus: A dinosaur bigger than T. rex swam and hunted its prey underwater | CNN.
Megalodon has also been found to be far larger than the gigantic theropod dinosaurs such as Spinosaurus, T-Rex, as well as the large ocean going marine reptiles such as Basilosaurus, and Tylosaurus.
The megalodon had a stomach volume of almost 10,000 litres, meaning it would have been capable of eating prey up to 26 feet (8 m) long. While it would have been able to chomp up a modern Orca, this means it could not swallow a T. rex whole like in 'Meg 2: The Trench'.
It's thought that megalodon sharks became extinct in part due to climate change: as oceans grew colder, they may not have been able to regulate their temperatures as needed. Lack of prey could be behind the megalodon's extinction, as many marine animals and fish could not survive the cold temperatures.
“Tyrannosaurus rex remains the one true king of the dinosaurs,” said paleontologist Steve Brusatte, study coauthor of the latest analysis and professor at The University of Edinburgh's School of Geosciences in Scotland, in a news release.
Giganotosaurus and Tyrannosaurus Rex did not live on the earth at the same time. Giganotosaurus was bigger and faster, but T-Rex had a stronger bite force and more teeth. In a fight between Giganotosaurus and T-Rex, the Tyrannosaurus would win.
The Spinosaurus recovered quickly from the blow and managed to out-maneuver the Tyrannosaurus and bite deep into his neck. Bellowing in pain, the T. rex groaned out in agony as the Spinosaurus gripped his neck with it's arms and snapped the rival dinosaur's neck, killing him instantly.
Megalodons are extinct. They died out about 3.5 million years ago. And scientists know this because, once again, they looked at the teeth. All sharks – including megalodons – produce and ultimately lose tens of thousands of teeth throughout their lives.
We know that megalodon had become extinct by the end of the Pliocene (2.6 million years ago), when the planet entered a phase of global cooling. Precisely when the last megalodon died is not known, but new evidence suggests that it was at least 3.6 million years ago.
The megalodon is related to the modern-day shark, while the blue whale is a baleen whale, a mammal. During the time that megalodon lived, it fed on more mid-sized whales and no whales the size of blue whales or other modern baleen giants existed.
Hour after hour of small bite after small bite, the orcas would slowly whittle megalodon down. Still, if there were a single mistake, megalodon would easily dispatch the orca in a single bite, but another would always be there to take its place.
Megalodon would win a fight against Titanoboa.
The monster snake is a one-trick pony, and that trick isn't any good against a massive shark. Even if it managed to wrap about the shark, it's much too small to kill it. Megalodon was about 9 feet across and weighed 100,000lbs.
This data suggests that mature adult megalodons had a mean length of 10.2 metres (about 33.5 feet), the largest specimens measuring 17.9 metres (58.7 feet) long. Some scientists, however, contend that the largest forms may have measured up to 25 metres (82 feet) long.
The T-rex would beat a Komodo dragon in a fight using its massive size advantage and powerful bite. Although unlikely, the Komodo dragon might attempt an ambush attack if it absolutely had to fight the monstrous dinosaur. It would probably not succeed in doing much damage, though.
Bizarre 500-toothed dinosaur
Nigersaurus, you might remember, we named for bones collected on the last expedition here three years ago. This sauropod (long-necked dinosaur) has an unusual skull containing as many as 500 slender teeth.
Yet, the T-Rex had a massive neck that the Spinosaurus wasn't going to break with its bite power. The T-Rex could thrash free and clamp down on the Spinosaurus. With all that power and the 12-inch teeth, the most likely outcome is that the T-Rex kills Spinosaurus.
rex tasted more like poultry than, say, beef or pork. Its flavor would likely have been closer to that of a carnivorous bird—perhaps a hawk—than a chicken. What does a hawk taste like? It's probably not far off from the dark meat of a turkey but would be more pungent because of its all-meat diet.
Mosasaurs were the ocean's most dominant predator at the end of the Cretaceous period and lived across the world's oceans. Large mosasaurs would have likely eaten almost any kind of prey they were able to catch, including fish, sharks, sea birds and even other mosasaurs, according to the U.S. National Park Service.
Megalodon, the biggest shark that ever lived, may have been killed off thanks to the success of the great white, new research suggests. A study of elemental traces in their teeth implies the huge sea monster faced competition for resources from its smaller and more nimble rival, say scientists.
The second biggest shark in the world is the basking shark
While they don't get quite as large as whale sharks, the largest one ever reliably measured was 12.27 metres or just over 40 feet long. This is enough to net them the title of the world's second-largest shark.