Shop Mobile More Submit  Join Login
InGen Carnivore Profile:



Name Meaning: Different Lizard

Nickname: Allo

Timeline: Late Jurassic (155-150 mya)

Diet: Carnivore

Family: Allosauridae, Allosauroidea, Carnosauria, Avetheropoda

Length: 28 to 32 feet long, with 39 foot specimens being rare

Height: 14 feet tall

Weight: 2.3 tons

Range: Isla Sorna, Isla Tacano


Second only to Tyrannosaurus as one of the most commonly seen theropod predators, Allosaurus is truly a predator to behold. It is also the only known large theropod predator that has more than one species active on Isla Sorna, with three species in total, though they each live in diverse regions on the island. The common species, Allosaurus fragilis lives in the North. The smaller A.europaeus thrives in the West while the bigger A.lucasi occupies the East. On Isla Tacano, A.europaeus and A.lucasi are sometimes shown to be sympatric. Despite being large predators, Allosaurs are exceptionally fast runners when hunting, even faster than Tyrannosaurus. While their jaw power is weak, Allosaurs are still efficient predators in their own right.


Allosaurs mainly prefer living in forested areas near the shores of lakes and riversides. Territories can be widespread, especially when it comes to establishing hunting grounds on clearings, plains, grasslands and game trails. 


Allosaurs are typically seen as being solitary like most large theropods, which is often the case with both males and females outside of mating season. But surprisingly, observers have reported seeing males living together in coalitions ranging from three to four members, similar to today's predator, the Cheetah. But unlike the more proficient raptors, this is usually a rare occurrence as Allosaur males commonly display hostility toward each other, judging from how some males are found with scars on their faces.  But on the other hand, females prefer living alone unless they have offspring. Male Allosaurs are extremely territorial, which leads them to immediately become violent when confronted with intruders, showing no fear even in the presence of larger predators. They're especially dangerous in the mating season and will fight each other over access to females. Mothers are ferociously protective of their young, providing them with plenty of parental care. At rare times, males will also help with raising the offspring as well.


Based on sightings,  Allosaurus readily targets prey that ranges from medium to large size, relying commonly on taking them by surprise, but they will pursue them if need be. Preferred prey consists mostly of ornithopods, with Camptosaurus being their most favored prey. Other ornithopods that are preyed upon include Maiasaura, Ouranosaurus, Corythosaurus, Parasaurolophus, Tenontosaurus, Iguanodon, Lambeosaurus, Edmontosaurus and Charonosaurus, along with the large, but elusive Shantungosaurus, though more likely it is the young and sick ones that would be hunted rather than a healthy adult. Despite being fierce hunters, Allosaurs will steer away from attacking dinosaurs like Ankylosaurus, Euoplocephalus and other ankylosaurids due to their armored covering. A single Allosaurus can never hope to bring down large ceratopsians like Triceratops on it's own, but a pair of them have been known to do so. Stegosaurus and Kentrosaurus are hunted occasionally, as well as the dangerously armed Therizinosaurus. When the chance comes, Allosaurus will instinctively gather in large numbers to bring down sauropods like Apatosaurus, Diplodocus, Mamenchisaurus, Camarasaurus and Brontosaurus, among others, with juvenile specimens being the most vulnerable. In fact, Allosaurs who stay together as coalitions stand more of a chance in bringing down large prey.

Upon reaching 3 to 5 meters in length, juvenile Allosaurs adapt themselves to hunting smaller prey like Dryosaurus, Thescelosaurus, Protoceratops, Psittacosaurus, Struthiomimus and Ornithomimus, all of which would be too fast for adults to hunt, though adults can still catch them through the use of ambush. However, when live prey becomes less frequent, Allosaurs will not hesitate to scavenge for carrion. 

Given that it possesses a weak bite force, Allosaurus is not capable of crunching through bone like T.Rex. Instead, Allosaurus would kill through varying methods depending on the age of the hunter and the size of it's prey. 

One commonly known killing method is that Allosaurus would use it's head like a living hatchet, slamming it's jaws onto the back of medium sized prey with plenty of force to inflict deep wounds which, through a combination of shock and bloodloss, lead to instant death.

Another form of killing strategy for Allosaurus would be to simply use it's arms to stab into the prey, holding on long enough to bite at the neck and pierce through the wind pipe.

But with large prey such as a sauropod, groups of Allosaurus use their teeth like knives to rip off pieces of flesh, weakening it in the process.

Interspecific Competition

Although it is a successful predator, Allosaurus will frequently come into competition with other predators that pose a threat to it. The allosaurs in the North of Isla Sorna often find themselves meeting face to face with the likes of Megalosaurus, Giganotosaurus, Mapusaurus, Albertosaurus, Saurophaganax, Torvosaurus, Carchardontosaurus, Carnotaurus, Fasolasuchus and Ceratosaurus denticulatus to name a few. But their greatest enemy in the North is Tyrannosaurus Rex. Indeed, out of all the large predators, T.Rex is a common adversary that Allosaurus fragilis often encounters. Tyrannosaurus will regularly chase Allosaurs off a carcass and even kill young ones if they encounter them. Fights between the two theropods are brutal, based upon at least one incident where a bull T.Rex viciously fought a trio of Allosaurs for rights to the carcass of a dead Apatosaurus. But in general when food is not the central focus, the two theropods will naturally ignore each other.

Smaller predators like Velociraptor and Deinonychus tend to avoid competing directly with Allosaurus by hunting at different times of the day, most notably at night. Allosaurs have even been known to actively attack raptors that get near their nests.

In the West region of Sorna, A.europaeus is at the top of the food chain and has very few competitors, with the only exceptions being Australovenator, Dromaeosaurus and Acheroraptor.

Up in the Eastern region, A.lucasi occupies the role of top predator. The asian theropod Yangchuanosaurus also lives here, and although they sometimes compete, they more preferably coexist by hunting different prey, with A.lucasi tackling Camptosaurus, Wuerhosaurus, Corythosaurus and Iguanodon while Yangchuanosaurus goes for juvenile sauropods. In sharp contrast, Utahraptor serves as more serious competition to both adults and juveniles.

Over on Isla Tacano, both of these Allosaur species deal with competition from Tarbosaurus, Daspletosaurus, Torvosaurus gurneyi, Teratophoneus, Tyrannotitan and the rare Tyrannosaurus "Canyon" Rex.

After doing some thinking, I decided on writing separate profiles about the carnivores that will be in my Jurassic Park fan fic series. I started with Allosaurus because this dinosaur hardly gets any recognition in the media like it used to.

My InGen Documents will continue, but I put them on hiatus for now.

Next up will be either Tyrannosaurus or Giganotosaurus, or perhaps even Ceratosaurus.

Anyway, be sure to read and leave a comment. I know this stuff may not be interesting, but I am trying my best.

Jurassic Park and InGen belong to Universal Pictures.

I found some sounds that just might fit Allosaurus:…
Paleo-Beast-Emperor Featured By Owner Jan 8, 2017  Hobbyist Traditional Artist
You've certainly pulled out all the stops with these InGen documents. Nice work. 'Nuff said.
Add a Comment:

:iconmegaspinosaur: More from MegaSpinosaur

More from DeviantArt


Submitted on
January 1
Submitted with Writer


2 (who?)