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Name meaning

"Thick-Headed Lizard"

Code name





2 metres (6 ft)


5 metres (16 ft)


450 kilograms (990 lb)


Isla Sorna

Novel appearances

The Lost World

Film appearances

The Lost World: Jurassic Park
Jurassic World

Game appearances

Jurassic Park (SNES game)
The Lost World: Jurassic Park (arcade game)
The Lost World: Jurassic Park (console game)
Warpath: Jurassic Park
Jurassic Park: Operation Genesis
Jurassic Park III: Park Builder
Jurassic Park III: The DNA Factor
Jurassic Park: Builder

Template Source
"A Pachy... a pachy... oh, hell. Uh, the fathead with the bald spot. Friar Tuck!"
Roland Tembo(src)

Pachycephalosaurus is the last, largest, and most famous member of the Pachycephalosauria, or thick-headed dinosaurs. In the 1970s paleontologist Peter Galton proposed that male pachycephalosaurs used their dome heads as battering rams, like Bighorn sheep. The idea caught the public's imagination. In The Lost World: Jurassic Park, you can even see the dome-headed pachycephalosaurs doing head butts (of course, these are genetically engineered dinosaurs and not necessarily exactly the same ones that lived 70 million years ago!). But by the 1990s, scientists began to question Galton's head butting theory. It was pointed out that animals who do butt heads have a wide surface area where the heads come into contact to prevent "head slippage." This happens when two animals butt heads at high speed and do not hit straight on. The risk breaking their necks when their heads suddenly snap to one side. Pachycephalosaurus has a domed, or rounded, head, which would minimize surface contact and therefore increase the risk of head slippage. This throws doubt on the idea of any high speed head-butting between pachycephalosaurs, but it does not exclude "head-pushing" of "head-ramming" against non-pachycephalosaurs.[1]

Wikipedia has a more detailed and comprehensive article on Pachycephalosaurus


Pachycephalosaurus by PonchoFirewalker01

Drawing from the book

Pachycephalosaurus first appeared in The Lost World when Levine and Malcolm were in the high hide viewing all of the dinosaur herds across the valley. The herd was quite large, consisting of about a dozen members if not more, and was first located to the south of the valley, the herd was often found in the middle of the island's roadways where they would congregate and take advantage of the mudholes in the road, usually to the distress of people having to use the roads in their cars. Levine was unsure whether they were Gravitholus albertae or Pachycephalosaurus wyomingensis at first but he eventually decided they were the latter. Levine and Malcolm were at odds over the issue that the animals butted heads. They are described as being 4–6 feet tall, dark-green, having large curved protruding foreheads, a rim of knobby horns, and having the overall demeanor of African Buffalo. They usually stood in a lazy, contented, cow-like manner unless disturbed, in which case they would attempt to ram things with their domed skulls.

The HerdEdit

Howard King came around a corner, and saw a herd of animals in the road. They were some kind of green dinosaur, about 4 ft tall, with big domed heads and a bunch of little horns, that smooth bulging curve on the forehead and all those little horns. The front bumper nudged the nearest animal, which grunted, took a couple of steps back, lowered it's head and butted the front of the car with a metallic clang! He opened the door, and climbed out, the animals jumped to their feet and the nearest one charged him. He had the door open; the animal smashed into it, slamming it shut, leaving a deep dent in the metal. He ran around the back of the car, just as another smashed into the rear taillight, shattering the plastic. A third animal charged the back of the car directly. King scrambled up onto the spare tire, as it slammed into the bumper. The jolt knocked him off, and he fell to the ground, rolling while the Pachycephalosaurus snorted all around him.


"Is Yoda

there?" The radio clicked. Harding said, "Ask him if there's any danger from a green dinosaur that's about 6 ft tall and has a domed forehead." Levine nodded. "Tell her yes. They're called Pachycephalosaurus" "Why?" "Because there's about 50 of them all around the car."


Now the puddle had become a mudhole, thanks to the dozen or so animals that sat in it. These were the green dome-headed that she had been watching. She had watched the Pachycephalosaurus with uneasiness. "Levine says nobody knows anything about these animals, Sarah" "Great," she said. "Levine says a complete skeleton has never been recovered. So nobody has even a guess about their behavior, except that they're probably aggressive."

Suddenly one of the animals charged the trunk of the tree she was in, butting it hard. The impact was surprisingly forceful. She struggled to hold on. Oh shit, she thought. Then she hit the ground, right beside the animals.

Sarah Harding was underneath the car, and now she was staring out at the animals feet. The pachys were stamping and snorting, Trying to get at her under the car. The nearest pachys snorted and banged on the bumper. They leaned down and twisted their heads, trying to get to her. "They have very bad breath," she said. Suddenly, they all thundered off.

Film canonEdit


"Friar Tuck"

Pachycephalosaurus appears in The Lost World: Jurassic Park. The thermal signature indicates that Pachys reside on the south side of the Isla Sorna. The InGen Hunters capture one pachycephalosaur on the Game Trail. Roland Tembo had nicknamed them "Friar Tuck", as he could not pronounce their real name.

It is also later seen wrecking havoc in the hunters' camp when it and the other captured dinosaurs are escaping their pens.

The Pachycephalosaurus were, however, smaller than their real life counterparts which were about 5 meters long. A possible explanation was that these individuals were not fully grown.


In their only appearance in The Lost World: Jurassic Park, the Pachycephalosaurus consisted several vocalizations which some sounded much aggressive or ominously threatening. The vocals are portrayed as raspy or blunt consisting of squawks or bleats from both Vultures, Sheep, Goats; and an occasional moans from a Camel and Rhino.

Pachycephalosaurus will be in Jurassic World in the new park on Isla Nublar fighting each other for guests in an enclosure called "Pachy Arena". In the new park these new clones were far larger than the counterparts seen on Sorna and far larger than the actual Pachycephalosaurus species (about a meter longer). However this may come to the inclusion that the individuals on Isla Sorna were indeed juveniles. 

Video GamesEdit

Jurassic Park (SNES game)Edit


Grant shooting a Pachycephalosaurus in the SNES game.

Pachycephalosaurus is depicted to be territorial, meaning that they will attack if the player/other dinosaurs were inside their territory. They're not a strong enemy as they can be easily killed.

Pachy snes manual

Pachycephalosaurus as seen in the SNES manual

The Lost World: Jurassic Park (arcade game)Edit

In this game, you will be sitting in your car, and a bunch of Pachycephalosaurus will charge you. In order to defeat them, you will have to shoot their body, shooting their bone-head wouldn't be effective. They sometimes come often.

The Lost World: Jurassic Park (console game)Edit

Pachycephalosaurus is encountered in the Human Hunter and Velociraptor levels. The Pachycephalosaurus is bigger than the ones seen in the film, furthermore suggesting that they were not fully grown in the film. Like in the arcade game they can only be hurt if hurt/shot in the body.

Warpath: Jurassic ParkEdit


Pachycephalosaurus from Warpath: Jurassic Park.

Pachycephalosaurus is an unlockable dinosaur in Warpath: Jurassic Park. Its skills are the same as Stygi, and its stage its the Mountianous Steppes. Its colors are emerald/cinammon, emerald/goldenrod. and amber. Although its weight scale is at the wrong number in the museum, the announcer says its correct weight. 

Jurassic Park: Operation Genesis Edit

see Pachycephalosaurus/Operation Genesis

Pachycephalosaurus is a two-star small herbivore, at closer to its correct length than those of the movie. It is the primary dinosaur that the player must create to endorse more new dinosaurs. It will fight against each other although they never seriously injure each other. They also use their hard heads to attack small carnivores (except Albertosaurus). They are friends with the Homalocephale.

Jurassic Park III: Park Builder Edit


Jurassic Park: Builder

Pachycephalosaurus is nr 092 of the Herbivore Twos that can be created in Jurassic Park III: Park Builder.

Jurassic Park III: The DNA Factor Edit

"Pachycephalosaurus is the eighth dinosaur species encountered in JPIII: The DNA Factor. In the level Perilous Highlands, it appears strong enough to smash large boulders that block the player's path by ramming them.

Jurassic Park: BuilderEdit

Pachycephalosaur JPbuilder

Jurassic Park: Builder

Pachycephalosaurus is available to purchase as your sixth dinosaur in the game.

Comics Edit

Toy linesEdit

Videos Edit

Jurassic Park - Pachycephalosaurus Sound Effects HD05:26

Jurassic Park - Pachycephalosaurus Sound Effects HD

Sources Edit

  1. Dinosaur Field Guide, page 102, 103.
The Lost World: Jurassic Park Dinosaurs
CompsognathusCorythosaurusEdmontosaurusGallimimusMamenchisaurusPachycephalosaurusParasaurolophusPteranodon • • StegosaurusTriceratopsTyrannosaurus rexVelociraptor
Jurassic World Dinosaurs
AnkylosaurusApatosaurusBaryonyxDimorphodonEdmontosaurusGallimimusIndominus rexMetriacanthosaurusMicroceratusMosasaurusPachycephalosaurusParasaurolophusPteranodonStegosaurusSuchomimusTriceratopsTyrannosaurus rexVelociraptor
Playable Warpath Dinosaurs
AcrocanthosaurusAlbertosaurusAnkylosaurusCarcharodontosaurusCryolophosaurusGiganotosaurusMegaraptorPachycephalosaurusSpinosaurusStygimolochStyracosaurusSuchomimusTriceratopsTyrannosaurus rex

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