Fighting Dinosaurs

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Fossil cast of the Fighting Dinosaurs at the Nagoya City Science Museum, Japan Fighting dinosaurs (2).jpg
Fossil cast of the Fighting Dinosaurs at the Nagoya City Science Museum, Japan

The Fighting Dinosaurs is a fossil specimen which was found in the Late Cretaceous Djadokhta Formation of Mongolia in 1971. It preserves a Protoceratops andrewsi and Velociraptor mongoliensis trapped in combat about 74 million years ago [1] and provides direct evidence of predatory behavior in non-avian dinosaurs. The specimen has caused much debate as to how both animals came to be preserved together with relative completeness. Several hypotheses have been proposed, including a drowning scenario, burial by either dune collapse or sandstorm, or alternatively they were not buried simultaneously.

Contents

History of discovery

Fossil of the Fighting Dinosaurs as found in situ in 1971 'Fighting dinosaurs'Tugrugeen Shireh, Gobi Desert, 1971.jpg
Fossil of the Fighting Dinosaurs as found in situ in 1971

From 1963 to 1971, Polish-Mongolian paleontological expeditions were carried out in the Gobi Desert with the objective of fossil-finding. The expedition of 1971 visited several localities of the Djadokhta and Nemegt formations, discovering the lower beds of the latter. In that year on August 3, during the fieldwork of a team composed of paleontologists Tomasz Jerzykiewicz, Maciej Kuczyński, Teresa Maryańska, Edward Miranowski, Altangerel Perle and Wojciech Skarżyński, several fossils of Protoceratops and Velociraptor were found at the Tugriken Shire locality (Djadokhta Formation) including a block containing a pair of them. The individuals of this block were identified as a P. andrewsi struggling with a V. mongoliensis. Although the circumstances of their burial were unknown, their pose indicated that they died simultaneously in a death match. [2]

The presence of the specimen on field was noted thanks to the overlapping skull fragments of the Protoceratops on the sediments, which eventually led to the excavation. It was soon nicknamed the Fighting Dinosaurs. The P. andrewsi individual is cataloged under the specimen number MPC-D 100/512 and the V. mongoliensis as MPC-D 100/25 (Mongolian Paleontological Center; originally GIN or GI SPS). [3] In 2000 the American Museum of Natural History organized the traveling exhibit Fighting Dinosaurs: New Discoveries from Mongolia which was mainly focused on important Mongolian fossils with emphasis on the Fighting Dinosaurs, which is now regarded as a national treasure of Mongolia. [4]

Interpretation

Skull of MPC-D 100/25 (Velociraptor mongoliensis) Velociraptor Fighting Dinosaur.jpg
Skull of MPC-D 100/25 (Velociraptor mongoliensis)

In 1974, Mongolian paleontologist Rinchen Barsbold suggested that the quicksand-like bottom of a lake could have kept them together or that both animals fell into a swamp-like waterbody, making the last moments of their fight underwater. [5] In 1993, Polish paleontologist Halszka Osmólska proposed that during the death struggle a large dune may have collapsed, simultaneously burying both Protoceratops and Velociraptor. Alternatively, the Velociraptor may have been scavenging an already dead Protoceratops and then got buried and eventually killed by an unknown event. [6]

In 1995, David M. Unwin and colleagues argued that scavenging was unlikely as there were numerous indications of a simultaneous death. The Protoceratops has a semi-erect stance and its skull is horizontally oriented, which would have not been possible if the animal was already dead. The Velociraptor has its right hand trapped within the jaws of the Protoceratops and the left one scratching the Protoceratops skull. As it lies on the floor with its feet directed to the prey's abdomen and throat areas, it is unlikely that the Velociraptor was scavenging. Unwin and colleagues also examined the sediments surrounding the specimen and concluded that the pair was buried alive by a sandstorm or sand-bearing event. They interpreted the final interaction with the Protoceratops being grasped and dispatched with kicks delivered by the low-lying Velociraptor. Finally, they suggested that populations of Velociraptor could have been aware of crouching behaviors in Protoceratops during high-energy sandstorms and used it for successful hunts. [7]

Life restoration depicting the fight Velociraptor v. Protoceratops (fixed).jpg
Life restoration depicting the fight

In 1998, Kenneth Carpenter suggested another scenario in which the multiple wounds delivered by the Velociraptor on the Protoceratops throat had the latter animal bleeding to death. As a last effort, the Protoceratops bit the right hand of the predator and trapped it under its own weight, causing the death and eventual desiccation of the Velociraptor. The missing limbs of the Protoceratops were later torn off by scavengers. Finally, both animals were buried by sandy sediments. Given that the Velociraptor is relatively complete, Carpenter suggested that it may have been completely or partially buried by sand. He concluded that the Fighting Dinosaurs is among the specimens that provide direct evidence for non-avian theropods as active predators and not strict scavengers. [3]

Size of the Fighting Dinosaurs Fighting Dinosaurs size.png
Size of the Fighting Dinosaurs

In 2016 Barsbold reported several anomalies within the Protoceratops individual: both coracoids have small bone fragments indicative of a breaking of the pectoral girdle, and the right forelimb and scapulocoracoid are torn off to the left and backwards, relative to its torso. He concluded that the prominent displacement of pectoral elements and right forelimb was caused by an external force that tried to tear them out. Barsbold suggested that scavengers were the most likely authors of these anomalies since the Protoceratops is missing other body elements and this event likely occurred after the death of both animals or during a point where movement was not possible. Because Protoceratops is considered to have lived in herds, another hypothesis is that members of a herd tried to pull out the already buried Protoceratops, causing the dislocation of its limbs. However, Barsbold pointed out that there are no related traces to support this latter interpretation. Lastly, he restored the course of the fight with the Protoceratops powerslamming the Velociraptor, which used its raptorial sickle claws to damage the throat and belly regions and its hand claws to grasp the herbivore's head. Prior to their burial, the fight ended up on the ground with the Velociraptor lying on its back under the Protoceratops. After the burial event, either a Protoceratops herd or scavengers tore off the buried Protoceratops to the left and backwards, slightly separating the Protoceratops and the Velociraptor. [8]

See also

Related Research Articles

<i>Velociraptor</i> Dromaeosaurid dinosaur genus from the Late Cretaceous

Velociraptor is a genus of small dromaeosaurid dinosaurs that lived in Asia during the Late Cretaceous epoch, about 75 million to 71 million years ago. Two species are currently recognized, although others have been assigned in the past. The type species is V. mongoliensis, named and described in 1924. Fossils of this species have been discovered in the Djadochta Formation, Mongolia. A second species, V. osmolskae, was named in 2008 for skull material from the Bayan Mandahu Formation, China.

<i>Oviraptor</i> Extinct genus of dinosaurs

Oviraptor is a genus of oviraptorid dinosaur that lived in Asia during the Late Cretaceous period. The first remains were collected from the Djadokhta Formation of Mongolia in 1923 during a paleontological expedition led by Roy Chapman Andrews, and in the following year the genus and type species Oviraptor philoceratops were named by Henry Fairfield Osborn. The genus name refers to the initial thought of egg-stealing habits, and the specific name was intended to reinforce this view indicating a preference over ceratopsian eggs. Despite the fact that numerous specimens have been referred to the genus, Oviraptor is only known from a single partial skeleton regarded as the holotype, as well as a nest of about fifteen eggs and several small fragments from a juvenile.

<i>Protoceratops</i> Genus of reptiles (fossil)

Protoceratops is a genus of small protoceratopsid dinosaurs that lived in Asia during the Late Cretaceous, around 75 to 71 million years ago. The genus Protoceratops includes two species: P. andrewsi and the larger P. hellenikorhinus. The former was described in 1923 with fossils from the Mongolian Djadokhta Formation, and the latter in 2001 with fossils from the Chinese Bayan Mandahu Formation. Protoceratops was initially believed to be an ancestor of ankylosaurians and larger ceratopsians, such as Triceratops and relatives, until the discoveries of other protoceratopsids. Populations of P. andrewsi may have evolved into Bagaceratops through anagenesis.

<i>Enigmosaurus</i> Extinct genus of reptiles

Enigmosaurus is a genus of therizinosauroid that lived in Asia during the Late Cretaceous period. It was a medium-sized, ground-dwelling, bipedal herbivore that represents the third therizinosaur taxon from the Bayan Shireh Formation, although it is known from the lower part. The genus is monotypic, including only the type species E. mongoliensis, known from a well preserved pelvis and other tentative body remains.

<i>Saurornithoides</i> Extinct genus of dinosaurs

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<i>Adasaurus</i> Extinct genus of dinosaurs

Adasaurus is a genus of dromaeosaurid dinosaur that lived in Asia during the Late Cretaceous period about 70 million years ago. The genus is known from two partial specimens found in the Nemegt Formation of Mongolia that were partially described in 1983 by the paleontologist Rinchen Barsbold.

Cretaceous Mongolia is one of the strangest and best preserved of all Mesozoic ecosystems. The shifting sand of what was, even then, the Gobi Desert have ensured that fossils of the animals that lived there can be found in exactly the position in which they were buried, with most of the bones together. The most notable fossil, dubbed the Fighting Dinosaurs, is the very well preserved remains of a Velociraptor, locked in combat with a Protoceratops, a small ceratopsian.

<span class="mw-page-title-main">Protoceratopsidae</span> Extinct family of ceratopsians

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<i>Udanoceratops</i> Leptoceratopsid dinosaur genus from the Late Cretaceous

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<span class="mw-page-title-main">Djadochta Formation</span> Geologic formation in Mongolia

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<span class="mw-page-title-main">Mahakala omnogovae</span> Extinct species of dinosaur

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References

  1. ↑ DASHZEVEG, DEMBERELYIN; DINGUS, LOWELL; LOOPE, DAVID B.; SWISHER, CARL C.; DULAM, TOGTOKH; SWEENEY, MARK R. (November 2005). "New Stratigraphic Subdivision, Depositional Environment, and Age Estimate for the Upper Cretaceous Djadokhta Formation, Southern Ulan Nur Basin, Mongolia". American Museum Novitates (3498): 1. doi:10.1206/0003-0082(2005)498[0001:nssdea]2.0.co;2. ISSN   0003-0082. Archived from the original on 2024-07-27.
  2. ↑ Kielan-Jaworowska, Z.; Barsbold, R. (1972). "Narrative of the Polish-Mongolian Palaeontological Expeditions, 1967-1971" (PDF). Palaeontologia Polonica. 27: 1−12. Archived from the original (PDF) on 2024-05-20.
  3. 1 2 Carpenter, K. (1998). "Evidence of predatory behavior by carnivorous dinosaurs" (PDF). Gaia. 15: 135−144. Archived (PDF) from the original on 2024-02-25.
  4. ↑ "Fighting Dinos". AMNH. American Museum of National History. 2000. Archived from the original on 2024-02-29.
  5. ↑ Barsbold, R. (1974). "Поединок динозавров" [Dueling dinosaurs]. Priroda (in Russian). 2: 81−83.
  6. ↑ Osmólska, H. (1993). "Were the Mongolian Fighting Dinosaurs really fighting?". Rev. Paleobiol. 7: 161−162.
  7. ↑ Unwin, D. M.; Perle, A.; Trueman, C. (1995). "Protoceratops and Velociraptor preserved in association: Evidence from predatory behavior in predatory dinosaurs?". Journal of Vertebrate Paleontology. 15 (supp. 003): 57A. doi:10.1080/02724634.1995.10011277.
  8. ↑ Barsbold, R. (2016). "The Fighting Dinosaurs: The position of their bodies before and after death". Paleontological Journal. 50 (12): 1412−1417. Bibcode:2016PalJ...50.1412B. doi:10.1134/S0031030116120042. S2CID   90811750.
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