Tyrannosaurus Rex

Tyrannosaurus Rex

Giganotosaurus

Giganotosaurus

Ecosystem

Forested plains, floodplains

Forested plains

Diet

Carnivore

Carnivore

Time Period

Late Cretaceous

Late Cretaceous

Continent

North America

South America

Weight

~9 tons
~10 tons

Height

~12-15 ft
~13-16 ft

Bite Force

~12,800 psi
~8,000 psi

Speed

~12-20 mph
~14-22 mph

Timeline of Discovery

1902: Tyrannosaurus Rex

Discovered by: Barnum Brown
Location: Hell Creek Formation, Montana, USA
Key Fact: The first T. Rex fossil was a partial skeleton, including the skull and vertebrae. It was named by Henry Fairfield Osborn in 1905.

1993: Giganotosaurus

Discovered by: Rubén Carolini
Location: Patagonia, Argentina
Key Fact: Giganotosaurus was one of the largest carnivorous dinosaurs, even larger than T. Rex. Its discovery challenged the idea that T. Rex was the biggest predator.

1990: T. Rex "Sue"

Discovered by: Sue Hendrickson
Location: South Dakota, USA
Key Fact: "Sue" is the most complete and well-preserved T. Rex skeleton ever found, with over 90% of its bones recovered.

Fun Facts

T. Rex Had Feathers

Young T. Rex dinosaurs were covered in feathers, which they lost as they grew older.

Giganotosaurus Hunted in Packs

Some scientists believe Giganotosaurus may have hunted in packs to take down large prey.

More Details

The Tyrannosaurus Rex and Giganotosaurus were two of the largest theropods to ever walk the Earth. While T. Rex was known for its immense bite force and robust build, Giganotosaurus was slightly larger and faster, making it a formidable predator in its own right. Both dinosaurs lived during the Late Cretaceous period but on different continents—T. Rex in North America and Giganotosaurus in South America. Hailing from what is now Argentina, Giganotosaurus was a lean, mean, killing machine. With a sleek, agile body and razor-sharp, slicing teeth, this predator was built for speed and precision. Clocking in at an estimated 30 mph, it could dart around prey and land multiple slashing bites. But there was one problem—its bite was more suited for cutting flesh, not crushing bone. That meant it needed to weaken opponents over time, rather than deliver an instant kill. T. rex was a walking tank—heavily muscled, thick-skulled, and built like a battering ram. With a bite force of over 35,000 Newtons, it didn’t just bite prey—it obliterated them. Its massive, banana-shaped teeth were designed to crush bone in a single chomp. And while it may not have been as fast as Giganotosaurus, it had the brains and senses to track, outthink, and overpower its opponent. Giganotosaurus would likely rely on its speed and agility, darting in to deliver quick, slicing bites before retreating. But against a predator as durable and intelligent as T. rex, this strategy might not work for long. All it would take is one well-placed bite from T. rex to the skull or neck, and the fight would be over. While Giganotosaurus could get lucky, Tyrannosaurus rex’s sheer power and bone-crushing weaponry give it the edge in a head-to-head battle. Final Verdict: T. rex Wins 7/10 Times!