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InGen Carnivore Profile:


Name Meaning: Piatnitzky Lizard

Nickname: Piat

Timeline: Middle Jurassic (166-164 mya)

Diet: Carnivore

Family:  Megalosauroidea, Piatnitzkysauridae

Length: 14 feet long

Height: 7 feet tall

Weight: 990 lbs

Range: Isla Muerta


Compared to it's more bigger and bloodthirsty cousin Megalosaurus, Piatnitzkysaurus is surprising not as deadly as it appears. It hunts during the day and sleeps during the night. Unlike most of Muerta's theropods, Piatnitzkysaurus is rather docile, but will attack if provoked, particularly when they have young with them.


Piatnitzkysaurus make their homes and nests in the mountains around the valleys where they hunt. During the night, they sleep within communal mountain caves to provide shelter for their offspring.

But occasionally, packs can be found wandering around beaches searching for carcasses.


Unlike InGen's other Megalosaurs which are extremely aggressive and solitary, Piatnitzkysaurus is surprisingly calm and non-violent. They live in groups which are led by mature adults, either male or female. But despite their calm nature, they become very ferocious towards other predators who threaten their young, regardless of size. They are especially powerful fighters when attacking in packs, with even the largest predators being attacked.

In the mating season, males make soft and low pitched snarls while bobbing their heads up and down along with stepping from side to side in a type of courtship dance to impress females. If a female is interested, it will respond by copying the male's movements. Once together, males and females become mates for life.

Young Piatnitzkysaurs remain under the care of adults who teach them how to hunt as they mature. Once they come of age, youngsters will branch off from the main pack to form one of their own with others. While mainly social animals, some lone ones have also been seen.

While they are not particularly aggressive towards humans such as observers, they show no restraint in attacking poachers and hunters who enter their caves.


As revealed by numerous observations, Piatnitzkysaurus is both an exceptional pack hunter and ambush predator. Their preferred choices of prey consist of medium sized sauropods, prosauropods, and ornithopods. As lightweight carnivores, they are one of the fastest and most successful predators on the island, being capable of chasing their prey over long distances, using the combined power of their group numbers to bring it down. 

Dinosaurs that are normally taken include Bellusaurus, Fukuisaurus, Magyarosaurus, Camptosaurus, Tenontosaurus, Plateosaurus, Lufengosaurus, Rhabdodon, Ouranosaurus, Yunnanosaurus, Blikanasaurus, Massospondylus, Bactrosaurus, Probactrosaurus and Gilmoreosaurus. Ornithomimosaurs make up 30% of the Piatnitzkysaur diet while ceratopsians and stegosaurs make up only 10%. In rare instances, Maiasaura and Hypacrosaurus are sometimes taken, next to juvenile individuals of Saltasaurus and Rhoetosaurus.

When alone, Piatnitzkysaurus exclusively hunts small prey, with Dryosaurus, Ornithomimus and Thescelosaurus being the favored targets. On occasion, they will also attack Pachycephalosaurus.

Interspecific Competition

Piatnitzkysaurus lives among a variety of different predators small and large on Isla Muerta, each one occupying a specific niche depending on preference and habitat. But as with modern predators, competition is not uncommon.

Based on observed sightings, the most prominent enemy of Piatnitkzysaurus is Deinonychus. Often called the lions and hyenas of Muerta, the two theropods are noted for being seen as natural enemies. In parts of the valley where they have overlapping ranges, both of them target the same prey and usually tend to steal each other's kills by mobbing one another. Deinonychus are especially threatening to young ones, which triggers immediate aggression from the protective adults. In one on one encounters, a single Deinonychus would regularly avoid direct confrontations with Piatnitzkysaurus rather than put up a fight.

But in comparison, a solitary Piatnitzkysaurus will immediately retreat to safety at the sight of larger predators, such as Ceratosaurus, Aucasaurus, Majungasaurus, Rugops, Rajasaurus, Abelisaurus, Postosuchus, Saurosuchus and Dimetrodon. However, packs stand more of a chance in fending off these predators.

It's also worth noting that the other carnivores Inostrancevia, Dryptosaurus, Herrerasaurus and Deltadromeus pose no such major competition. Deltadromeus are more accustomed to hunting large prey on game trails, Dryptosaurus occupies hunting grounds in the short grasslands, Herrerasaurus prowls in the dense jungles while Inostrancevia stalks through the upland habitats.

The pseudosuchian Ornithosuchus that live around the valleys seems to behave more strangely around Piatnitzkysaurus. In a way, rather than competing, the two species appear to share a kind of respect in which neither of them attack each other. Instead, Ornithosuchus shares a kleptoparasitic interaction with them in which it waits until the theropod has finished eating a meal before proceeding to feed off the leftovers.

It took some time, but I managed to make a profile for this lesser known dinosaur. It's a real shame that this dinosaur has gone unnoticed since it's discovery, that's why I chose to do a profile on it.

Anyway, be on the lookout for the next profile, which will be about another hardly known dinosaur called Deltadromeus.

Jurassic Park belongs to Universal Studios.
FallingSkyPancakes Featured By Owner Feb 13, 2017  Student General Artist
I find myself learning more about these majestic reptiles from your journals, its amazing.
Paleo-Beast-Emperor Featured By Owner Feb 13, 2017  Hobbyist Traditional Artist
Sweet. I can't believe I totally overlooked this particular saurian myself.
AntonellisofbBender Featured By Owner Feb 13, 2017  Student Filmographer
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February 12
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