Achillobator – Asian Theropod of the Late Cretaceous

Imagine a time when the earth was ruled by creatures of immense size and power–a time when the Achillobator, a dinosaur of remarkable strength and agility, roamed the lands. This dinosaur, whose name means “Achilles’ hero,” is a testament to the wonders of nature and the diversity of life that once existed on our planet.

The Achillobator, a dinosaur that lived during the Late Cretaceous period, is a fascinating subject of study. For instance, its unique characteristics and the environment it inhabited provide us with valuable insights into the prehistoric world. As we delve into the life of the Achillobator, we invite you to join us on this journey back in time, to a world that was vastly different from the one we know today.

Achillobator Key Facts

Achillobator pronunciationAh-kil-oh-bah-tor
Meaning of nameAchilles’ hero
Type SpeciesAchillobator giganticus
When it Lived100.5 to 83.6 MYA
Period & TimeLate Cretaceous
EpochCenomanian to Santonian or
Length13.0 to 16.0 ft
Height4.1 ft in hip height
Weight0.2 tons
MobilityMoved on two legs
First Discovery1989 by Mongolian and Russian paleontologists
Location of first findBaynshire Formation, Mongolia
First Described1999 by Altangerel Perle, Mark Norell, James Matthew Clark

Achillobator Origins: Taxonomy, Timeline, and Discovery

Having a name that translates to “Achilles’ hero,” it is a fascinating dinosaur that has captured the attention of paleontologists and dinosaur enthusiasts alike. The name is derived from the Greek hero Achilles and the Mongolian word ‘baatar,’ which means hero. This dinosaur is a member of the clade Theropoda, and the family Dromaeosauridae, and is represented by the species Achillobator giganticus.

Monochrome illustration of an Achillobator, a feathered dinosaur, shown in profile with a long, bushy tail and a robust build. The creature's sharp claws and predatory stance are evident, highlighting its carnivorous nature and bird-like features.
image by PaleoNeolitic is license under CC BY 4.0

The Achillobator lived during the Late Cretaceous period. This era was characterized by a warm climate and a rich diversity of plant and animal life. The Achillobator, with its carnivorous diet, was a part of this vibrant ecosystem.

The first discovery of the Achillobator was made in 1989 in Mongolia during an expedition by Mongolian and Russian paleontologists. The dinosaur was later described by Altangerel Perle, Mark Norell, and James Matthew Clark in 1999. This discovery has provided valuable insights into the life and characteristics of this remarkable dinosaur.

Fossil Evidence

The first fossil evidence of the Achillobator was unearthed in the Bayan Shireh Formation in Mongolia, a region renowned for its rich fossil deposits. This formation has yielded a wealth of information about the diverse array of dinosaurs that inhabited the earth during the Late Cretaceous period with the Achillobator being one of the many dinosaurs discovered in this region.

Photograph of an Achillobator pelvis fossil, showcasing the intricate details of the bone structure. The image highlights the robust and complex nature of the pelvic bones, which played a crucial role in the dinosaur's mobility and posture.
image by PaleoNeolitic is license under CC BY 4.0

The fossil evidence of the Achillobator primarily consists of a partial skeleton that has been instrumental in allowing paleontologists to gain insights into its physical characteristics and lifestyle. The skeleton includes fragments of the dinosaur’s skull, vertebrae, and limbs–each piece contributing to the overall understanding of this fascinating creature.

In addition to the initial discovery, there have been subsequent finds that have further enriched our understanding of the Achillobator. These include additional skeletal fragments and footprints, each providing further evidence of the dinosaur’s physical attributes and behaviors. These discoveries, while fragmentary, have collectively painted a more comprehensive picture of the Achillobator and shed light on its life and its role in the ecosystem of the Late Cretaceous period.

Achillobator Size and Description

The Achillobator is a subject of great interest in the field of paleontology as a dinosaur of considerable size and unique physical characteristics. Its distinctive features and adaptations provide a window into the life and environment of the Late Cretaceous period.

Short description of Achillobator

In short, this was a typical theropod dinosaur, a group known for their bipedal locomotion and carnivorous diet. Its physical characteristics, as inferred from the fossil evidence, suggest a dinosaur adapted for a life of predation. The body was likely streamlined with a long tail for balance and strong hind limbs for swift movement. Its forelimbs, while smaller, were robust and likely featured sharp claws, a common trait among dromaeosaurids. The head was likely elongated and equipped with sharp teeth suitable for its carnivorous diet.

Size and Weight of Type Species

This was a large dinosaur with estimates suggesting a length of up to 16 feet. This size places it among the larger members of the dromaeosaurid family, a group of dinosaurs known for their agility and predatory prowess. The weight is harder to determine due to the fragmentary nature of the fossil evidence. However, given its size and the general body plan of dromaeosaurids, it’s reasonable to assume that it was a substantial creature, possibly weighing several hundred pounds.

Silhouette size comparison between a human and Achillobator, depicting the significant size difference. The Achillobator stands at a height slightly taller than the human, with a large, muscular build and a long, feathered tail.
image by PaleoNeolitic is license under CC0

The Ultimate Dino Quiz

Do you want to test your knowledge of dinosaurs? Then try this Ultimate Dino Quiz! Don’t worry if you get some of the answers wrong, and look at it as an opportunity to refresh and improve your knowledge!

Don’t forget to try our other games as well!

The Dinosaur in Detail

The Achillobator, with its unique features and adaptations, stands as a testament to the diversity and adaptability of life during the Late Cretaceous period. Its large size combined with its agility and predatory adaptations likely made it a formidable presence in its environment.

One of the most distinctive features is its well-developed Achilles tendon, which is a feature that is reflected in its name. This tendon, located in the hind limb, likely played a crucial role in providing the dinosaur with the strength and flexibility needed to move swiftly and efficiently.

While fragmentary, the fossil evidence has provided valuable insights into this dinosaur’s life and characteristics. Moreover, each fossil find enhances our understanding of this remarkable creature, painting a picture of a dinosaur that was well-adapted to its environment and a successful predator in its ecosystem.

The Achillobator in its Natural Habitat and Environment

The Achillobator and other Asian dinosaurs inhabited a Cretaceous environment that was vastly different from the one we know today. The Late Cretaceous was characterized by a warm climate and a diverse array of plant and animal life. It provided the dinosaurs of the time with a rich and varied ecosystem to inhabit.

As a carnivorous dinosaur, the Achillobator was likely a predator that hunted and fed on other dinosaurs and possibly smaller animals. Its strong hind limbs and sharp claws would have made it a formidable hunter capable of swift movements and powerful attacks.

The Achillobator’s impact on its environment is a subject of ongoing study. As a large predator, it likely played a significant role in shaping the ecosystem around it by influencing the behavior and distribution of other animals and possibly even affecting the vegetation and landscape.

Interesting Points about Achillobator

  • Its name, which translates to “Achilles’ hero,” is a reference to its well-developed Achilles tendon. It was a feature that likely played a crucial role in its locomotion.
  • It was among the largest of the dromaeosaurids, reaching lengths of up to 16 feet.
  • It lived in Asia during the Late Cretaceous period. It was a time characterized by a warm climate and a rich diversity of plant and animal life.
  • The first fossil evidence was discovered in Mongolia, a region of Asia known for its rich fossil deposits.
  • The Achillobator, with its large size and predatory adaptations, likely played a significant role in shaping its ecosystem. It would have had a great influence on the behavior and distribution of other animals.

Contemporary Dinosaurs

The Late Cretaceous period was a time of great diversity in life for Asian dinosaurs. Among the contemporaries of the Achillobator were the Tarbosaurus, Velociraptor, Oviraptor, and Protoceratops.

The Tarbosaurus, another large theropod dinosaur, was likely one of the top predators in its environment. Despite the similarity in size, it was likely smaller than the Achillobator. It suggests they may have utilized a different hunting strategy and prey preference.

Another theropod dinosaur, which differs from Tarbosaurus and Achillobator by being considerably smaller, was the Velociraptor. This was likely a swift and agile predator, using its speed and cunning to capture prey.

The Oviraptor and Protoceratops, on the other hand, were likely not direct competitors with the Achillobator. The Oviraptor, despite being a theropod, is believed to have been omnivorous. The Protoceratops was an herbivorous dinosaur, feeding on the vegetation of the Late Cretaceous.

These dinosaurs, each with their unique adaptations and lifestyles, shared the world with the Achillobator. Their interactions, as competitors or simply inhabitants of the same ecosystem, would have shaped the world of the Late Cretaceous. Furthermore, it would have influenced the evolution and behavior of the Achillobator.

Featured Image Credit: Durbed, line drawing by Pilsator, CC BY-SA 3.0, via Wikimedia Commons


The information in this article is based on various sources, drawing on scientific research, fossil evidence, and expert analysis. We aim to provide a comprehensive and accurate overview of the dinosaurs. However, please be aware that our understanding of dinosaurs and their world is constantly evolving as new discoveries are made.

This article was last fact checked: Joey Arboleda, 06-09-2023