An Ultimate Guide to the Gigantoraptor: Thief of Giants

Leave a comment / / Updated on: 23rd September 2023

Name Meaning“Giant Thief”Height3.5 meters (11.5 feet)
PronunciationGi·gan·torap·torLength7.9 meters (26 feet)
EraMesozoicLate CretaceousWeight1.5-2.2 short tons (3,000-4,400 lbs)
ClassificationDinosauria,‭ Saurischia & TheropodaLocationInner Mongolia, China (Asia)

Gigantoraptor Pictures

A 3D Rending of Gigantoraptor
A 3D Rending of Gigantoraptor | Vac1 via Istock

The Gigantoraptor

Gage Beasley Prehistoric's Gigantoraptor Concept
Gage Beasley Prehistoric’s Gigantoraptor Concept

While the Earth is millions of years far gone from its prehistoric stage, life as it was then still fascinating humans, and some have dedicated their lives to bringing the creatures and happenings of those times to light.

Of all the animals that existed in these prehistoric times, dinosaurs are the most famous.

All dinosaurs fall under the Dinosauria superorder but belong to further classifications.

Although each dinosaur had unique features, one of the most outstanding was the Gigantoraptor.

This dinosaur captured the attention of experts and enthusiasts alike because of its imposing size and captivating appearance.

Gage Beasley's Prehistoric Shirt Collection
Gage Beasley’s Prehistoric Shirt Collection
Gage Beasley's Prehistoric Plush Collection
Gage Beasley’s Prehistoric Plush Collection

Gigantoraptor is derived from a combination of two words: giganto and raptor.

The term giganto originates from the Greek word gigas, meaning giant or enormous.

The word raptor is derived from the Latin term raptor, translating to thief or robber.

Thus, the name Gigantoraptor can be interpreted as “giant thief,” alluding to this dinosaur’s colossal size and potential predatory nature.

Standing as one of the most oversized known members of the dinosaur family, the Gigantoraptor’s imposing stature was indeed an evolutionary feat.

Although its size awed scientists, this was not its most fascinating feature.

Life restoration of Gigantoraptor erlianensis
Life restoration of Gigantoraptor erlianensis | PaleoNeolitic via License

What surprised experts the most about this dinosaur had a mix of avian and dinosaurian features.

The Gigantoraptor had features balanced between avian dinosaurs while maintaining such a huge size.

This discovery challenged accepted theories about feather evolution and sparked fascinating discussions about the Gigantoraptor’s physiology, behavior, and evolutionary status.

The discovery of the Gigantoraptor opens a window into the astounding variety of prehistoric life and offers insightful information on evolution’s intricate and dynamic process.

Keep reading this article to discover more interesting facts about this fascinating dinosaur.

Description and Size

Gage Beasley Prehistoric's Gigantoraptor Size Comparison Chart
Gage Beasley Prehistoric’s Gigantoraptor Size Comparison Chart

The theropod group, a subgroup of dinosaurs as a whole, is where the Gigantoraptor belongs.

Theropods were a varied group of primarily carnivorous, bipedal dinosaurs, and they included well-known species like Velociraptor and Tyrannosaurus rex.

The Gigantoraptor belongs to the Caenagnathoidea superfamily and the Caenagnathidae family, which contains other herbivorous and omnivorous dinosaurs.

As such, the Gigantoraptor was a species of a genus of oviraptorosaurian dinosaur that roamed the Earth during the Late Cretaceous period, approximately 70 million years ago.

As mentioned and based on fossil evidence, the Gigantoraptor is one of the heaviest theropods on record.

The length of the Gigantoraptor is an estimated 26 feet, from the tip of its snout to the end of its tail.

Size comparison of several giant theropods from various periods of geologic time
Size comparison of several giant theropods from various periods of geologic time | Matt Martyniuk via License

While determining the exact height of the Gigantoraptor is challenging due to the incomplete nature of the fossils, it is estimated that this dinosaur stood approximately 11.5 feet tall at the hip.

Based on the skeletal structure of the Gigantoraptor and comparisons with its closest relatives, scientists estimate that it weighed between 3,000 and 3,600 pounds; some others estimate the weight to be around 4,400 pounds.

Because of its weight, the Gigantoraptor is on record as one of the heaviest known oviraptorosaurs.

It had long, strong hind limbs essential to its bipedal movement. It also had reasonably long arms that culminated in ferocious claws.

These formidable claws were probably for self-defense, digging, and grabbing prey.

The dinosaur’s agility and adaptability are demonstrated by its capacity to change between quadrupedal and bipedal positions.

Because the Gigantoraptor was a mix of bird and dinosaur, it had several unique features that experts describe as a combination of bird-like and dinosaurian traits.

Gigantoraptor Face 3D Illustration
Gigantoraptor Face 3D Illustration | CoreyFord via iStock

It had a long, slender neck like modern-day birds, and its head was adorned with a crest, similar to those found in other oviraptorosaurs, suggesting possible display or species recognition purposes.

Also, this dinosaur had a toothless beak, further highlighting its resemblance to modern-day birds.

Although there is little direct evidence of the Gigantoraptor’s skin covering, it is broadly accepted that this dinosaur possessed feathers.

Its body was probably covered in feathers, from basic down-like structures to more complex feathers connected to flying.

Underscoring its avian origins, these plumage characteristics may have been for insulation, show, or concealment.

Habitat and Distribution

The Bayan Mandahu Formation in Inner Mongolia, China, is where the Gigantoraptor was initially found.

This region is known for its rich fossil deposits and has yielded numerous discoveries of dinosaurs and other prehistoric creatures.

The first fossil discoveries were made in 2005 while Dr. Xu Xing, a prominent Chinese paleontologist, led an expedition.

The Gigantoraptor bones found belonged to a single individual, making it the first and widely believed to be the only confirmed finding of this species.

The dinosaur did not get its name until 2007 by Xu Xing and some other paleontologists.

Scientists surmise these giant dinosaurs lived in various landscapes based on fossil evidence and geological research.

The initial remnants were found in the Bayan Mandahu Formation, a massive floodplain formerly dotted with rivers, lakes, and woods.

It is thought that the Gigantoraptor flourished in these verdant, subtropical habitats, utilizing plentiful resources for food.

As mentioned, this area has yielded the only confirmed remains of this dinosaur species.

However, the finding of the Gigantoraptor has increased scientific knowledge of the diversity of dinosaurs that lived in Asia throughout the Late Cretaceous.

Further discoveries might likely reveal other populations or related species as research and excavation operations continue in various places.

Gigantoraptor theropod dinosaurs come down to a lake to drink in Mongolia, China
Gigantoraptor theropod dinosaurs come down to a lake to drink in Mongolia, China | CoreyFord via iStock

The Gigantoraptor’s geographic range indicates that it lived in various settings in eastern Asia during the Late Cretaceous.

The earliest fossils were discovered in the Erlian Basin, known for its arid conditions.

The dune deposits around the fossil sites reinforce the idea that the Gigantoraptor was suited to a desert-like environment.

Also, the presence of aquatic and terrestrial fossils alongside the Gigantoraptor fossils suggests that it coexisted with several other dinosaur species, such as the famous Velociraptor and Tarbosaurus.

Behavior and Diet

Due to the scarcity of Gigantoraptor fossils, it is challenging to paint a complete picture of its behavior.

However, paleontologists have made several inferences based on its physical characteristics and comparisons with other theropods.

2 3D generated Gigantoraptors
2 3D generated Gigantoraptors | MR1805 via iStock

According to experts, it is plausible that these dinosaurs exhibited some social interaction, as evidenced by the presence of feathered counterparts like birds.

Paleontologists often rely on behavioral inferences from related species and comparisons with modern-day animals to make educated hypotheses about the social behavior of extinct dinosaurs.

It is crucial to keep in mind that each species may have had different social behaviors, even if the Gigantoraptor belonged to the same dinosaur family as the Velociraptor and other dromaeosaurids, which are known to have displayed some social behavior like group hunting.

Given that current birds frequently use feathers for communication and show, the existence of feathers in the Gigantoraptor suggests that it may have engaged in sophisticated social activities.

However, the lack of further fossil evidence related to social behavior makes it challenging to draw firm conclusions.

As concrete evidence is sometimes hard to come by, figuring out an extinct creature’s nutrition can prove demanding.

Yet, some hints may be gleaned from the skeletal characteristics and comparisons to similar species.

The Gigantoraptor was a theropod, but unlike most carnivorous dinosaurs, it lacked sharp fangs in its beak.

Its possible herbivorous or omnivorous diet has prompted researchers to make this assumption.

According to some studies, the Gigantoraptor may have used its beak to trim grass, much like contemporary birds like ostriches.

Its body and long legs may have helped it carry its weight and forage for plant material, including leaves, fruits, and low-lying plants.

2 3D generated Gigantoraptors on a foraging quest
2 3D generated Gigantoraptors on a foraging quest | MR1805 via iStock

Another theory is that the Gigantoraptor could have been an omnivore, supplementing its plant-based diet with small animals, insects, or scavenged meat.

The toothless beak might have been utilized for probing and capturing small prey, while the hind limbs allowed for swift movement when hunting or scavenging.

Researchers also consider the ecology and surroundings the Gigantoraptor lived in to comprehend its eating.

Paleontologists can learn about the available food sources throughout the Late Cretaceous period by studying the fossil record.

The likely diet of the Gigantoraptor can be determined by examination of plant remains and research on living species.

If it was a herbivore, it may have shaped vegetation and affected the distribution of plants.

Being an omnivore, it could also have had more influence by managing tiny animal populations and taking part in nutrient recycling.

Life Cycle

Like many dinosaurs, the Gigantoraptor likely began its life as an egg.

These eggs were probably large, elongated, and reminiscent of other oviraptorosaurs.

Size chart with egg for Gigantoraptor erlianensis
Size chart with egg for Gigantoraptor erlianensis |
Matt Martyniuk via License

Fossil discoveries suggest that they were approximately 17 inches long and possibly had a blue-green coloration, camouflaging within their natural environment.

The Gigantoraptor eggs gave way to little, helpless hatchlings when their incubation was up.

A downy coating of fluffy feathers helped the freshly emerging giant raptors regulate their body temperature.

The insulation provided by these feathers allowed the hatchlings to maintain a constant body temperature.

These hatchlings were most likely precocial, meaning they could do limited independent mobility soon after hatching, like many dinosaur species.

The Gigantoraptor grew rapidly while still a juvenile.

The development of adult traits and considerable developmental changes at this period of life were distinguishing features.

Illustration of an adult and a young Gigantoraptor
Illustration of an adult and a young Gigantoraptor | XiaImages via iStock

Although flying was not feasible due to the Gigantoraptor’s enormous size, its feathers changed as it matured from the downy stage to a more mature, flight-like stage.

The adolescent Gigantoraptors possibly exhibited increased independence and ventured farther from their nesting sites in search of food.

While they were still growing, their primary focus shifted toward survival and preparing for adulthood.

While they were flightless, these feathers likely played a role in display and communication within the species.

As adults, experts believe Gigantoraptors engaged in courtship rituals and seasonal breeding.

Evolution and History

As mentioned, the Gigantoraptor belongs to the theropod group of dinosaurs, which includes prominent species such as the Tyrannosaurus rex and Velociraptor.

A Gigantoraptor claw
A Gigantoraptor claw | Kabacchi via License

Oviraptorosaurs, to which the Gigantoraptor belongs, were a diverse group of feathered dinosaurs known for their beak-like snouts and unique behaviors.

The first fossils of the Gigantoraptor were discovered in 2005 by Xu Xing and colleagues in the Bayan Mandahu Formation of Inner Mongolia, China.

The holotype specimen, designated as Gigantoraptor erlianensis, referencing the Erlian Basin where it was found, consisted of partial postcranial remains, including a massive thigh bone measuring over 4.6 feet.

The finding of these giant raptors has shed important light on the origins of oviraptorosaurs.

Their enormous size casts doubt on preconceived notions about the family’s ecological functions and body plans.

A Gigantoraptor skeletal reconstruction
A Gigantoraptor skeletal reconstruction | Kabacchi via License

Experts now believe it is possible that gigantism independently developed many times in various lineages of theropod dinosaurs, as shown by the occurrence of the Gigantoraptor.

Like most dinosaurs, Gigantoraptors became extinct around 65 million years ago, at the end of the Cretaceous period.

Like other dinosaurs, its fossilized remains serve as crucial evidence for understanding Earth’s ancient past and the evolutionary history of life on our planet.

Interaction With Other Species

Given its massive size, the Gigantoraptor likely had limited interactions with smaller herbivorous dinosaurs.

However, interactions with larger herbivores, such as hadrosaurs and ceratopsians, may have occurred, albeit rarely.

Gigantoraptor’s immense stature might have deterred most potential rivals or predators.

Two gigantoraptors are watched by Pterosaurs
Two gigantoraptors are watched by Pterosaurs | mariephoto28 via iStock

Instead, it likely focused on occupying different ecological niches to avoid direct competition.

Being an omnivorous dinosaur, the Gigantoraptor probably performed a variety of ecological functions.

It is possible that the Gigantoraptor scavenged carrion from dead animals, however, it is difficult to say for sure.

Because of its size, it may have gotten to larger corpses that could have been out of reach for smaller scavengers.

The decomposition process and general ecological balance may have been greatly aided by the Gigantoraptor’s consumption of carrion.

While the Gigantoraptor may not have been a primary predator due to its lack of formidable hunting adaptations, it is possible that it preyed upon smaller animals, such as smaller dinosaurs, small mammals, or reptiles.

This dinosaur shared some of its habitats with a variety of formidable carnivorous dinosaurs, including tyrannosaurs like Tarbosaurus and Alioramus.

Gigantoraptor (centre), Archaeornithomimus (far left & far right) and Alectrosaurus (background)
Gigantoraptor (centre), Archaeornithomimus (far left & far right) and Alectrosaurus (background) | ABelov2014 via License

Interactions between the Gigantoraptor and these apex predators are speculative, but it is plausible that Gigantoraptor would have been viewed as a potential threat due to its size.

The Gigantoraptor may have relied on its agility and speed to evade these predators, further highlighting the importance of maintaining a safe distance.

Cultural Significance

While its impressive size and unique characteristics have garnered considerable attention in the scientific community, the Gigantoraptor also holds cultural significance, inspiring awe and sparking curiosity among individuals worldwide.

For instance, this dinosaur has made its mark in various forms of popular media, permeating movies, video games, and literature.

Gigantoraptor erlianensis pencil drawing
Gigantoraptor erlianensis pencil drawing |
Nobu Tamura via License

The Gigantoraptor’s cultural impact extends to education and science outreach programs.

To hold visitors’ attention, particularly young minds, museums and educational institutions have used the dinosaur’s enormous size and distinctive traits.

Children and adults of all ages may learn about the wonders of prehistoric life via exhibits that include fossil reproductions and interactive displays.

Including the Gigantoraptor in textbooks and curricula has helped students learn more about prehistoric environments and the dinosaurs’ evolutionary history. 

Scientific speculation surrounding the dinosaur’s lifestyle and interactions with its environment fuels the public’s imagination, stimulating curiosity and furthering our understanding of ancient ecosystems.

The discovery of the Gigantoraptor itself holds immense cultural significance, as it adds to our collective knowledge of Earth’s history and evolution.

The unearthing of fossils and subsequent research shed light on the Gigantoraptor’s physical characteristics, behavior, and ecological role.

The cultural relevance of the Gigantoraptor includes environmental protection and public awareness campaigns.

By understanding the ecological contexts in which these prehistoric creatures thrived, we gain insights into the fragility and interconnectedness of ecosystems today.


The Gigantoraptor was an impressive dinosaur that lived approximately 70 million years ago during the Late Cretaceous period.

Belonging to the theropod group, it was one of the largest known oviraptorosaurs, reaching an estimated length of 26 feet and weighing 3,000 to 3,600 pounds.

What makes the Gigantoraptor particularly fascinating is its unique combination of avian and dinosaurian features.

It had a slender neck, a crest on its head, and a toothless beak, resembling modern-day birds.

While its exact behavior and social interactions remain uncertain due to limited fossil evidence, its feathers suggest the possibility of complex social activities.

The Gigantoraptor inhabited various landscapes in eastern Asia, including floodplains, woodlands, and possibly desert-like environments.

The discovery of this dinosaur expands our understanding of prehistoric life, evolution, and ancient ecosystems, while also captivating the public’s imagination through its cultural significance in popular media, education, and scientific outreach.


Is Gigantoraptor bigger than the T-Rex?

No, Gigantoraptor was not bigger than T-Rex.

While Gigantoraptor was one of the largest known oviraptorosaurs, it was still significantly smaller than Tyrannosaurus rex.

The estimated length of the Gigantoraptor is about 26 feet, whereas T-Rex could reach 40 feet or more.

How do scientists continue to study and learn more about the Gigantoraptor despite the scarcity of fossils?

Despite the scarcity of fossils, scientists continue to study and learn more about the Gigantoraptor through various methods and approaches, including paleontological excavations, virtual reconstruction, comparative anatomy, genetic and molecular studies, etc.


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