Buzz
We all recognize T. rex as a colossal, fearsome beast from the past, notorious for its boundless hunger to devour everything in its path. Yet, in reality, Tyrannosaurus rex doesn't quite live up to its legendary portrayal in films. Today, the scientific consensus suggests that Tyrannosaurus rex may not have been a hunter at all.
But T. rex wasn't the only giant meat-eating dinosaur to roam the Earth during the Mesozoic Era. When compared to some of the truly terrifying theropods of the time, Tyrannosaurus rex could be considered almost tame. While T. rex will forever hold the title of 'king of the dinosaurs' in our imaginations, it's time to explore other contenders that could challenge its dominance.
10. Sinornithosaurus
Sinornithosaurus was a small, feathered dromaeosaur closely related to Velociraptor. With its long, slender build and a snout resembling that of a crocodile, Sinornithosaurus sported a wide, toothy grin. It resembled a bird-like reptile, adorned with vibrant, large feathers.
It is quite possible that these creatures hunted in groups, similar to other dromaeosaurs, though there is little solid evidence to confirm this. What makes Sinornithosaurus particularly fascinating is that scientists now believe it to be the first known dinosaur to possess a venomous bite.
The exact nature of the venom produced by Sinornithosaurus remains unknown. But just the thought of Velociraptor-like predators lurking in the dark of the ancient world, ready to spring from the shadows and deliver a fatal bite, is enough to send a chill down the spine.
9. Therizinosaurus
Therizinosaurus was an enormous, 100-kilogram (220 lb) behemoth that roamed what is now Mongolia. Sporting long, needle-like claws and a neck reminiscent of a giraffe's, its massive forearms initially led paleontologists to believe it was a colossal, extinct sea turtle. Eventually, it was correctly identified as a distant relative of Tyrannosaurus rex.
Despite having claws that could make Freddy Krueger envious, Therizinosaurus primarily used them for foraging for plant matter. However, don’t be fooled into thinking this was a gentle giant. The scientific community is still divided on whether Therizinosaurus was strictly herbivorous or occasionally dined on meat along with its greens.
The ambiguity surrounding its diet only adds to its terrifying nature. The most frightening thought isn’t just encountering a Therizinosaurus, but wondering if it sees you as a mere nuisance—or a potential meal.
8. Ceratosaurus
Ceratosaurus was a medium-sized theropod that lived during the Jurassic Period, primarily in regions that are now part of North America and Europe. It had a stocky build with short, thick arms and a prominent, horn-like feature on its skull.
At first glance, it may appear to be just another generic Tyrannosaurus rex variant with simple regional differences, but don’t let its basic appearance fool you. Ceratosaurus was a formidable hunter that held a significant advantage over its peers—four fingers on each hand, rather than the usual three.
This seemingly small advantage helped Ceratosaurus climb high in the Late Jurassic food chain. Among its greatest achievements was surviving for over 11 million years. Given its remarkable survival and unique traits, it’s unfortunate that Ceratosaurus doesn’t receive as much attention as some of the other dinosaurs featured here.
7. Carnotaurus
Carnotaurus was a theropod from the Late Cretaceous period that inhabited much of what is now South America. It had a notably bulky frame, with large spikes and bulging features covering its body.
Carnotaurus stood out from other dinosaurs due to its pair of menacing horns, which overshadowed its terrifying, reptilian eyes. These horns were so striking that the creature's name, meaning 'meat-eating bull' in Latin, was fitting.
Its arms were incredibly small, to the point where Tyrannosaurus rex might have chuckled. In fact, some paleontologists believe these tiny limbs served no real function at all. But don’t let that mislead you. It's now widely believed that Carnotaurus was even faster than the legendary Tyrannosaurus rex.
6. Utahraptor
Utahraptor was an Early Cretaceous dromaeosaur (feathered theropod) that roamed what is now Utah. With its long tail and forearms, it had a streamlined, sleek appearance that made it resemble a larger version of the well-known Velociraptor.
Utahraptor was the largest dromaeosaur by far, measuring a staggering 7 meters (23 ft) in length. Its claws, designed for ripping flesh, reached an impressive 23 centimeters (9 in). Combined with an estimated weight of 900 kilograms (2,000 lb), this dinosaur was a formidable predator.
Utahraptor also had a significant advantage over the smaller raptors: it became the only dromaeosaur in American history to be officially recognized as a state dinosaur—specifically, the state dinosaur of Utah! With its sharp claws, teeth, and newfound legal title, Utahraptor could very well be a contender for the title of 'king of the dinosaurs.'
5. Pachycephalosaurus
Pachycephalosaurus was an herbivorous, bipedal dinosaur from the Ornithischia order. It roamed during the Late Cretaceous Period, alongside notable creatures such as T. rex and Triceratops.
Pachycephalosaurus had a surprisingly solid build, with thick legs, tail, and neck. However, its most distinctive feature was its heavily reinforced, bone-crusted skull. This skull might have been used as a weapon to defend itself from predators or challenge rivals. In fact, its skull was 30 times thicker than that of a human.
What’s truly surprising is that Pachycephalosaurus may not have been the harmless herbivore many thought. It might have actually been a carnivore. So, not only would Pachycephalosaurus charge at you with a skull 30 times thicker than a human’s, but it might have also tried to eat you for dinner.
4. Troodon
Troodon was a bipedal theropod from the Cretaceous Period, measuring approximately 3 meters (11 ft) from snout to tail. It had a slender, streamlined build with sharp teeth and large eyes, proportionally bigger than those of most creatures its size.
It is believed that Troodon didn’t have particularly long arms, but it boasted an impressive number of teeth—more than any other known theropod. Troodon was also notably fast. With a maximum running speed of 64 kilometers per hour (40 mph), it was almost as fast as the fastest racehorse ever recorded.
What sets Troodon apart, however, is its remarkable intelligence. It is theorized to have been the smartest dinosaur by a wide margin. As a result, a hunting Troodon wouldn't have been a mindless creature, but rather a sharp, calculated, and agile predator.
3. Spinosaurus
Spinosaurus was a predatory theropod from the Cretaceous Period, living in what is now North Africa. It had a sleek, torpedo-shaped body with a slender neck, tail, legs, and skull. As the largest known carnivorous dinosaur, it surpassed even other giant theropods like Tyrannosaurus rex and Giganotosaurus in size.
The most striking feature of Spinosaurus was the massive sail on its back. While the exact purpose of this sail remains unclear, the prevailing theory suggests it may have been used for attracting mates, much like the tail of a modern peacock. However, the debate continues.
Spinosaurus also holds the distinction of being the only dinosaur known to engage with Sarcosuchus, a 12-meter (40 ft), 10-ton crocodile. This interaction clearly demonstrates that Spinosaurus was more than capable of earning the title of the ‘king of the dinosaurs.’
2. Allosaurus
Allosaurus is perhaps the most famous dinosaur on this list, a theropod from the Jurassic Period that roamed what is now the United States. With a surprisingly streamlined build for its size, this creature featured a slender neck and moderately thick legs.
In contrast to other theropods from the Jurassic, Allosaurus was built for speed, making it the fastest large theropod of its era. Capable of reaching speeds up to 21 kilometers per hour (13 mph), it could effortlessly chase down its prey.
Allosaurus also boasted impressive length for its time, measuring between 8–11 meters (25–35 ft) from snout to tail tip. So unique was this creature among its contemporaries that its name translates to “Different Lizard.” The paleontologist who named it was so struck by its distinctiveness that he believed it deserved such a title.
1. Giganotosaurus
Giganotosaurus was a carnivorous theropod from the Late Cretaceous Period, inhabiting what is now South America. With its thick legs, torso, and neck, it had a relatively hefty build, resembling other large theropods from the era.
Despite its bulky appearance, Giganotosaurus was actually slightly larger than Tyrannosaurus rex. It is believed to have been the primary predator of Argentinosaurus, the largest land animal to ever roam the Earth.
Giganotosaurus was also remarkably fast, capable of reaching speeds up to 50 kilometers per hour (31 mph). This made it faster than the fastest human ever recorded, cementing its position as the apex predator of Late Cretaceous South America.
