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EXHIBIT 23

Majungasaurus

Majungasaurus crenatissimus

Majungasaurus left feeding marks on bones of both sauropods and its own species.

Evidence profile
PERIODLate Cretaceous[1]
DIETCarnivoreEvidence-informed classification [1]
TOTAL LENGTHNot established hereComparable estimate unavailable
FOSSILS FOUNDMadagascar[1]
CompareRead the dossierView the sources

MEET THE ANIMAL

Meet Majungasaurus

Majungasaurus crenatissimus was a predatory dinosaur from Late Cretaceous Madagascar. Skull material from the Maevarano Formation includes an unusually complete, well-preserved example studied in detail. It belonged to the abelisaur family, whose members were distinctive meat-eating dinosaurs. Its short, deep and broad skull gives it a different outline from the long, narrow heads of some other predators. [S1]

The head combines thickened bones with extensive internal air spaces. Researchers described a thickened area on top of the skull and strongly modified bones around the nose. These features are useful for identification and for investigating how the skull worked. They also remind us that a rough or heavy-looking fossil does not mean every bone was solid throughout. Understanding the interior can change the picture suggested by the surface alone. [S1]

Tooth marks document feeding on sauropod carcasses and on members of its own species. These traces establish consumption, but they do not establish that Majungasaurus killed those particular animals. [D2]

The rest of the body provides another striking contrast: its forelimbs were highly reduced. Research on these small arms complements the detailed work on the skull. Preserved anatomy gives a stronger starting point than an imagined daily routine. The reviewed evidence does not establish courtship displays, parenting or an ordinary social-group size for this species. [D3]

Overview sources
  1. Craniofacial anatomy of Majungasaurus crenatissimus from the Late Cretaceous of MadagascarSociety of Vertebrate Paleontology; Ohio University author repository · Accessed 2026-10-04Inspected: abstract

PREHISTORIC ANIMAL DOSSIER

A life in profile.

The animal, the evidence, and the questions still open.

Majungasaurus crenatissimus was an abelisaurid predator from Cretaceous Madagascar with an unusually roughened and ornamented skull. Tooth marks document feeding on sauropod carcasses and members of its own species, while the manner of death remains unresolved.

Profile scope: Species: Majungasaurus crenatissimus; older research uses Majungatholus atopus.

Time
Late Cretaceous
Fossil locations in this exhibit
Madagascar
How to read the evidence

Source supported identifies a description documented by the cited source. Inferred marks a reconstruction or functional estimate. Debated marks competing interpretations. Not established means the sources reviewed for this dossier do not support a firm conclusion; it does not mean a behavior never occurred.

A size reference is an estimate, not a population range. Nesting evidence does not by itself establish courtship, mate choice, or lifelong pairing.

Body length

Not established

Not established here

The reviewed sources do not establish a numerical body-length estimate for this record.

Body mass

Not established

Not established here

The reviewed sources do not establish a numerical body-mass estimate for this record.

Diet

Source supported

Carnivore; sauropods and conspecific carcasses

Tooth-marked bones establish carcass consumption, including its own species. They do not establish that Majungasaurus killed the individuals it consumed. [D2] [D3]

Habitat & fossil setting

Source supported

Maevarano Formation, Madagascar

The feeding study samples Late Cretaceous Maevarano sites. Fossil locality is established; a specific habitat preference is not established here. [D2]

Movement

Inferred

Bipedal theropod; gait details unreviewed

Two-legged posture is inferred from its theropod skeletal reconstruction. These inspected summaries do not establish speed or a detailed gait. [D1]

Distinctive anatomy

Source supported

Roughened, ornamented skull; reduced forelimbs

Skull research documents unusual surface ornamentation and extensive air sinuses. The university project account documents research on the highly reduced forelimbs. [D1] [D3]

Reproduction & life together

Reproduction & nesting

Not established

Not established here

The reviewed sources do not establish taxon-specific nest structure, clutch size or parental care.

Courtship & mating

Not established

Not established here

The reviewed sources do not establish a mating ritual, pair bond or breeding season for this taxon.

Social behavior

Not established

Not established here

The reviewed sources do not establish a taxon-specific group structure or social hierarchy.

Dossier research & sources

Sources and inspection notes for the claims in this profile.

  1. The Skull of MajungasaurusOhio University; Lawrence Witmer · Accessed 2026-10-02Researcher's companion summary to Sampson & Witmer (2007); skull and name history. · Inspected: page
  2. Cannibalism in the Madagascan dinosaur Majungatholus atopusNature; Rogers, Krause & Curry Rogers (2003) · Accessed 2026-10-02Original feeding study abstract, under the older name now applied to M. crenatissimus. · Inspected: abstract
  3. David Krause: Mahajanga Basin ProjectStony Brook University · Accessed 2026-10-02Researchers' project account linking the cannibalism study to M. crenatissimus and documenting reduced forelimbs. · Inspected: page

THE STORY IN THE FOSSILS

Meet Majungasaurus.

Majungasaurus had roughened skull bones and a median frontal horncore. A partial growth series shows that the skull became taller and more robust in larger individuals. Its exceptionally short forelimbs retained muscle attachment features, so their reduction does not imply that they were entirely functionless. [2] [3] [5]

Tooth-marked bones from Madagascar’s Maevarano Formation document feeding on sauropods and other Majungasaurus. This establishes consumption of its own species, but cannot by itself show whether those animals were killed or scavenged. Earlier research used the name Majungatholus, now superseded by Majungasaurus. [4] [1]

A note on scale and time

We have not established a comparable adult total-length estimate for this taxon in this draft. Specimen measurements in the text describe those individuals. A numerical age interval has not been reviewed here. Unknown does not mean zero.

Sources & editorial notes

Sources and evidence notes for this exhibit.

  1. The skull of MajungasaurusOhio University / Sampson and Witmer (2007) · Accessed 2026-10-02Witmer author summary, lines 17–23: 68 Ma Madagascar skull, former Majungatholus name, rough skull surface and inferred head tissues. Main commercial-use restriction concerns supplied content/images, not adoption of factual observations.
  2. Craniofacial anatomy of Majungasaurus crenatissimusJournal of Vertebrate Paleontology / Ohio University · Accessed 2026-10-02Indexed original-paper page 38: specimens with median frontal horncores, including immature and near-adult skulls. Full 20 MB PDF exceeds browser text retrieval limit.
  3. Myology of the forelimb of Majungasaurus crenatissimusJournal of Anatomy / PubMed · Accessed 2026-10-02Burch (2017) abstract lines 241–246 and figure captions: extremely reduced but robust forelimbs, muscle attachment evidence and retained possible function.
  4. Cannibalism in the Madagascan dinosaur Majungatholus atopusNature · Accessed 2026-10-02Rogers et al. (2003) original-paper abstract retrieved in search: tooth-marked bones at three Maevarano localities, sauropod and conspecific feeding. Published under old name Majungatholus atopus; open endpoint errors.
  5. Ontogenetic changes in the craniomandibular skeleton of Majungasaurus crenatissimusActa Palaeontologica Polonica · Accessed 2026-10-022016 original-paper abstract lines 27–29: partial growth series and increased skull height/robustness in adults.

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