Today's megafauna, the largest animals on Earth, pale in comparison to the giant animals that once roamed the Earth.
Although this is probably welcome news to most of us humans.
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Pisces Leviathan
The mighty Leviathan whale has been likened to the “jaws” of the Miocene epoch.
After fossil remains were found in Peru, experts believe that the giant whale inhabited the southeastern Pacific Ocean about 13 million years ago.
The Peruvian specimen is the only known remains of Leviathan, a massive monster with teeth roughly the size of a 2-liter Coca-Cola bottle.
Based on the size of the 3-meter (10-foot) skull, experts believe Leviathan's body length was between 13 and 16 meters (45 and 60 feet).
The mouth alone is about 6 feet long and 4 feet wide, three times the size of a killer whale's mouth, and large enough to fit an adult human.
While its head and skeleton resemble those of a modern sperm whale, its teeth are much larger and have been found to be up to 14 inches long – more than twice the size of a T. rex gnaw.
The diet of this sea monster is unclear.
Its powerful snout and massive lower and upper teeth are thought to indicate that it fed on larger, stronger prey than squid.
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Patagotitan
Patagotitan weighed about 70 tons, the equivalent of about five buses.
They made their way through the towering forests of today's Patagonia about 100 to 95 million years ago, during the Late Cretaceous.
This 122-foot-long herbivore belonged to a group known as titanosaurs, known for their enormous size.
It is one of the largest dinosaurs ever discovered.
The length of the femur alone is 2.38 metres, which is much longer than the length of an average human.
It is not known how or why the Patagotitans disappeared, as their extinction preceded an infamous extinction-level meteorite strike by about 34 million years.
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Spinosaurus
Spinosaurus is known to be the longest carnivorous dinosaur to ever roam the Earth, spanning a whopping 14 meters from head to tail.
It is about three times as long as the African elephant, and 20% heavier.
This 7.5-ton creature roamed the Earth 95 to 70 million years ago in the late Cretaceous period.
It is well characterized by the large, sail-like hump on its back, which experts believe could be used for mating displays, regulating body temperature, or even intimidating other animals.
Although it roamed largely on land, Spinosaurus may have enjoyed a semi-aquatic life, catching fish while completely submerged in water.
Although this idea has been disputed by some scholars.
Spinosaurus died out 30 million years before Tyrannosaurus.
It is unclear exactly how they perished, as some paleontologists believe floods wiped them out, while others say it was due to drought.
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Titanboa
If you are afraid of snakes, look away, because they are the largest snakes.
Due to the fragility of the snake's bones, little is known about the long-extinct Titanoboa, or Titanoboa cereigonensis.
What remains of the monster indicates that it could have been a snake between 45 and 50 feet long, with the thickest part of its body reaching a human's waist.
Titanboa knew a version of Earth, where the Amazon rainforest is now, that was incredibly swampy.
During this period about 58 to 60 million years ago, known as the Paleocene, more than 150 inches of rain fell annually, compared with 80 inches in the Amazon now.
This giant serpent reigned a few million years after the fall of the dinosaurs, which were wiped out by a catastrophic asteroid strike.
It was this explosion that led to the emergence of the tropical rainforests that exist today along the equator.
Titanboa, regarded as the largest snake that ever lived, flourished alongside other massive species such as 13-foot-long crocodiles and 8-foot-long turtles.
