Tyrannosaurus rex is one of the most famous, fearsome and majestic creatures that ever lived on Earth. In a story featuring giant monsters, T. rex is an obvious choice. However, some authors just find that T. rex itself is a little too cliché and want something more original, or that using a real dinosaur species just wouldn't fit the setting. So instead of using the tyrant lizard king itself, they show an original creature that obviously resembles it, resulting in something of an Expy of T. rex — a T-Rexpy.
The T-Rexpy is usually a generic dinosaur or dinosaur-like monster (occasionally a descendant of T. rex that somehow survived into the modern age) but it can also be a fantasy creature like a dragon, an alien or a mutant. It is typically bipedal, with a bulky body, long tail, relatively short arms, and a massive head with a broad mouth full of sharp teeth. However, it may have extra features that distinguish it from T. rex while potentially making it even more fearsome, such as horns, spikes, armor-like scales or feathers (which T. rex may or may not have had). As T. rex's puny arms are one feature that diminish its badass image, sometimes the T-Rexpy will have longer arms with massive claws instead; however, some portrayals double down on this visual element and may remove the arms altogether to make the creature a fully Armless Biped. In the most bizarre examples, it may even have wings. It will typically be at least as large as a real T. rex was, but there's no upper limit — some T-Rexpies are Kaiju-sized. Most T-Rexpies are outwardly reptilian, but some have feathers, whether sparse or body-wide, and may even be specifically giant predatory birds. More unusual examples of this trope, such as explicitly mammalian, fishlike, insectoid, or robotic T-Rexpies, also exist.
The T-Rexpy will often end up in a Behemoth Battle, usually with another dinosaur-like monster or a giant ape. Although most of the time it relies on brute strength in combat, it will sometimes be given a Breath Weapon, since Dinosaurs Are Dragons. It will often have the words "rex" or "tyrant" somewhere in its name, or a synonym or near-synonym such as "imperator", "regem" or the like.
When real dinosaurs, such as Allosaurus, Carnotaurus or Giganotosaurus, get depicted with T. rex-like features, that is not this trope, but rather Artistic License – Paleontology. Also, a T-Rexpy cannot be explicitly a Tyrannosaurus rex (though it can be an "evolved" descendant of it); again, unrealistic portrayals of the actual creature go under Artistic License – Paleontology.
Sub-Trope of Prehistoric Animal Analogue, when other extinct animals are used for fictional designs. For depictions of tyrannosaurs and T-Rexpies being portrayed as intimidating, see Terrifying Tyrannosaur.
Sometimes these creatures will be presented as the Fantastic Fauna Counterpart of T. rex. See also Whateversaurus, Raptor Attack, Prehistoric Monster and Notzilla.
- Digimon: The Agumon line is based on bulky, three-fingered T. rex-like dinosaurs. Its most prominent members in this regard are Greymon, a tyrannosaur-like beast with an armored facial mask, and Tyrannomon, a more Prehistoric Monster-like take with giant claws and a row of Godzilla-like spikes down its back.
- Kirby: Right Back at Ya!: The 2-part episode "Fossil Fools" has the Villain of the Week creating hybrid monsters between dinosaurs and the show's characters. The first encountered is the D-Rex, a cross between King Dedede and a Tyrannosaurus.
- Zoids features a bunch of them, typically typecast as rivals to the protagonist driven Liger-type Zoids, or as the main Zoid of the Big Bad.
- Zoids: Chaotic Century features the Geno Saurer and its Mid-Season Upgrade, the Geno Breaker, piloted by Raven, the series' obligatory Brooding Rival character.
- Zoids: New Century features the Berserk Fury as one of two legendary Ultimate X Zoids, piloted by Child Prodigy Vega Obscura. Rather than being a recurring rival, it shows up near the end of the series as a Final Boss.
- Zoids Fuzors is set in a different continuity, featuring the Buster Fury and its Mid-Season Upgrade, the Gairyuki.
- Zoids Genesis features the Bio Tyranno, which is piloted by the Big Bad Emperor Jiin.
- Zoids: Wild: Emperor Gallagher (or Gigaboss, if you prefer) rides the Death Rex, a legendary Zoid said to have caused a mass extinction in the past.
- Zoids Wild Zero: Omega Rex, a mutated variation of Death Rex, appears as the primary antagonist of the show's second main story arc.
- Zoids Wild Senki: in a departure from the usual setup, the Xeno Rex appears as a Republican Zoid rather than an Imperial Zoid.
- The Zoids franchise has many, many other Tyrannosaur Zoids, such as its former mascot, the Gojulas, but these tend to be NotZillas rather than proper tyrannosaurs. An exception is Gojulas Giga, has NotZilla elements like dorsal spines, but has an otherwise more theropod-like body and is expressly based on Giganotosaurus.
- Moon-Boy and Devil Dinosaur and Moon Girl and Devil Dinosaur: The eponymous Devil Dinosaur looks like a T. rex, but is larger, stronger, more intelligent (although not human-level intelligent), and colored bright red. Despite his appearance, he's never explicitly identified as a T. rex. He is sometimes said to come from an alternate universe called Dinosaur World (Earth-78411), where it can be assumed dinosaurs continued to evolve after their extinction in most worlds, and is also possibly a mutant.
- Old Man Logan: The Venom symbiote takes over a T. rex from the Savage Lands and uses it to chase after Hawkeye and Logan before being killed by Black Bolt.
- Calvin and Hobbes: One strip features a dinosaur species named Calvinosaurus, a kaiju-sized sauropod-eating superpredator that resembles T. rex, though with brow ridges and three-fingered hands more similar to Allosaurus.
- Akane no Guilty Crown: In Chapter I, Shu and Funeral Parlor fights a GHQ hybrid called the Fafnir rex. It has two fingers like a T. rex from its long arms, yet the body structure is shaped like a Giganotosaurus, alongside having a tadpole-like tail like a Spinosaurus.
- Realistic Pokémon: Tyrantrum and Tyrunt had a picture shared with Bastiodon. Subverted by Tyranitar; you'd think it would be a tyrannosaur too, but it's actually shown as a strange, bipedal ankylosaur, complete with armor.
- Vow of Nudity: The demonsaurus, essentially a T-Rex covered in spikes, is the alpha predator in the abyssal swamps, and its den is littered with half-eaten corpses of all the other creatures Haara and Fiora had encountered to that point.
- A Bug's Life features a bird as a secondary antagonist — it plays this role quite well, being significantly larger than all the insect characters, having a Giant Foot of Stomping and a song that, from the bugs' perspective, resembles a Mighty Roar. Likely pretty appropriate, as birds are themselves theropod dinosaurs.
- The Sponge Bob Movie Sponge Out Of Water: When Patrick takes the Time Machine for a joyride, he unwittingly brings back a Squidasaurus Rex to the present day, which proceeds to rampage within the Krusty Krab. The Squidasaurus Rex is essentially a T. rex with Squidward's head attached.
- Gargantua 1998 focuses on amphibians that have mutated into semi-aquatic Rex-like monsters.
- Godzilla is inspired by a number of different dinosaurs, including the dorsal plates from Stegosaurus and the prehensile long arms Iguanodon was believed to have had, but he takes a large number of cues from T. rex, being a bipedal, bulky, long-tailed monster with sharp teeth and claws.
- Originally, Godzilla in Godzilla vs. King Ghidorah was meant to be revealed as a mutated T. rex before they changed it into the fictional species Godzillasaurus who is pretty heavily based on a T. rex.
- The kaiju Gorosaurus was created for King Kong Escapes as an obvious homage to the tyrannosaur King Kong originally fought in King Kong (1933), being a large theropod without any special abilities (with the exception of a fancy kick) who gets his jaw broken at the end. Supplementary material says he's descended from Allosaurus however.
- There was a version of Godzilla from an unproduced movie named Godzilla King of the Monsters 3-D for 1983 who was heavily inspired on T. rex◊ for his design, especially in his head shape.
- Godzilla (1998) also uses T. rex as an inspiration for the monster's design, with a more realistic theropod-like stance. This is despite the fact that "Zilla", as the fans dubbed the film's monster, is supposed to be a mutant iguana.
- Jurassic World: The Indominus rex is an in-universe example, a genetically modified hybrid dinosaur that is intended to be "super T. rex" of sorts, albeit with longer, grasping arms and camouflage abilities. It's also much more intelligent than any tyrannosaurid as a result of adding raptor genes, allowing it to both escape its enclosure and giving it a nasty sadistic streak.
- King Kong (2005): The fictional theropod Vastatosaurus rex is designed to resemble an evolved Tyrannosaurid with notable similarities to Tyrannosaurus itself. There are some obvious differences: instead of a prominent overbite, the V. rex has overlapping teeth like a crocodile, as well as hardened body armor and three fingers on its hands. They're also much larger due to island gigantism, with almost twice the body mass of a Tyrannosaurus (17 tons vs 9). All of these differences were very intentional, rather than the filmmakers just not caring, and particularly allude to the ambiguous identity of the theropod that Kong fought in the original 1933 film—the three-fingered hand in particular is a common mistake, when tyrannosaurids famously have only two.
- The Valley of Gwangi: Although it's meant to be an allosaur of some kind, the titular Gwangi is so heavily based on T. rex that even Ray Harryhausen wasn't sure what species it was in the end, often going back and forth between Allosaurus and Tyrannosaurus. Eventually, in his autobiography Ray Harryhausen: An Animated Life, Harryhausen settled with the idea that it's a hybrid specimen of the two, classifying Gwangi as Tyrannosaurus al.
- Fighting Fantasy: The "Pit Fiend" encountered late in Deathtrap Dungeon can be described as a more upright T. rex popular with gladiator arenas, hence its name. It should be noted that the actual Tyrannosaurus rex has a separate entry in the Out of the Pit supplement, and it does have stronger stats than a Pit Fiend.
- After Man: A Zoology of the Future has an unusual mammalian variant of this trope, the raboon, which is a baboon that evolved into a Tyrannosaurus-like carnivore walking on two legs, with short arms, a thick tail and massive fangs. It is said to be primarily a scavenger that chases away smaller, weaker predators from their kill, which is a now-debunked theory about how Tyrannosaurus foraged.
- The Atomic Time of Monsters: A number of Kaiju, including the central character Tyrantis, his mate Tyranta and his nemesis the Terror, resemble gigantic, spiky takes on archaic depictions of tripodal tyrannosaurs.
- Empire from the Ashes: The planet Birhat's mixed up ecology includes a creature that, on early scouting flyovers, is reported to seemingly "combine the more objectionable aspects of Tyrannosaurus and a four-horned Triceratops." The monstrosity is eventually named "Tyranotops".
- Evolution: In "The Kingdom of the Rats", one of the new species of predators descended from rodents are immense, bipedal mice with massive heads built to thrust great slashing teeth into their prey, and long thick tails to balance them. The narration explicitly compares them to the bygone tyrannosaurs.
It looked like one of the great carnivorous dinosaurs of the Cretaceous days. Its forearms were small, its tail was thickened for balance, and its hind legs were awesomely powerful machines of muscle and bone. Its incisors had developed into ferocious slashing weapons, to be deployed by thrusts of the heavy head. The mouse-raptor was a land shark, like a tyrannosaur, a body design rediscovered and made devastatingly effective.
- Expedition: Darwin IV was envisioned by Barlowe as an alien world going through its equivalent of the Late Cretaceous, and this includes a Tyrannosaurus analogue — the arrowtongue, a heavily-built Armless Biped that chases down prey in rapid pursuit and subdues it with its harpoon-like tongue, and the dominant predator of the open plains.
- Quintaglio Ascension: The Quintaglios are the descendants of small tyrannosaurs, transplanted to an inhabitable moon to escape the extinction of the dinosaurs. The species that did the actual transplanting genetically engineered them to have five fingers, the ability to regenerate severed limbs, and a high intelligence. They also have some peculiarities like muzzles that flush blue when they lie and the ability to rest on their tails, kangaroo-style. There are also actual tyrannosaurs (although probably not rex) that they call "blackdeaths" for their solid black coloration.
- Son Of Man: The Eaters are huge, scaly, bipedal carnivores with oversized heads, dozens of fangs, tiny arms, a long tail... and they telepathically inform the main character that they are descended from humans, who genetically engineered themselves into a Tyrannosaurus-like form.
- Subterranean: The apex predators of the underground Antarctic Lost World are monotreme mammals that convergently evolved the appearance (and size) of T.rex.
- Dinosaur Great War Izenborg: The first antagonist is a T. rex-like Kaiju known as Uuru.
- Primeval: The Gorgonopsid in Season 1 (based mainly on Inostrancevia) is practically a sabre-toothed T. rex with four legs and a longer back. It even goes from serving in an antagonistic role to serving as an anti-hero when it combats the Future Predator like the Jurassic Park T. rex taking on the Velociraptors.
- Ultraman Neos: The Rock Eaters are a race of Kaiju that resemble an upright red T. rex. They fight a King Kong Copy named King Bamos, to further the resemblances.
- BattleTech: The planet Hunter's Paradise is noted to have dinosaur-like beasts as its dominant life forms. The T-Rex II is not the largest predator on the planet, but it's one of the most impressive looking and Egomaniac Hunters from around the Inner Sphere like to go there to try and bag one. Typically hunting methods involve piloting light Battlemechs.
- Magic: The Gathering: Dinosaur cards have included a large number of big, heavy-headed, small-armed and aggressive apex predators modeled more or less directly on T. rex, such as the scythe-armed tyrannaxes of Mirrodin's biometallic jungles, the imperiosaur of Muraganda and the Ixalani feathered tyrannosaurids alternatively referred to as dreadmaws, monstrosaurs, regisaurs, swordtooths and the like.
- Smash Up has the King Rex of the Dinosaur faction, which highly resembles a 100 ft tall Tyrannosaurus and has a power of '7', the strongest base power in the game that comes without a drawbacknote , but is the only unit in the game with no Effects or Talents.
- Warhammer has the Carnosaur, one of the many kinds of dinosaur/pterosaur-like megafauna native to the jungles of Lustria. They look like exaggerated Carnotaurus (with a smidgen of Raptor Attack) and are one of the most prized war mounts of the Lizardmen.
- Warhammer 40,000: Knarlocs and Great Knarlocs are offshoots of the Kroot, featherless avian aliens who can alter their bodies by absorbing traits from creatures they eat, which have trapped themselves in dead-end paths by overconsuming the meat of bestial predators and thus became stuck as huge, feral animals. They resemble green predatory dinosaurs with muscular legs, short forelimbs, stumpy tails and serrated, bone-crushing beaks, not unlike a tyrannosaur with the head of a flesh-eating parrot. Common Knarlocs are only about large enough for Kroot to ride, but Great Knarlocs reach the sizes of the larger theropods and are the alpha predators of the jungles of the Kroot homeworld.
- Yu-Gi-Oh! has several dinosaur monsters that are clearly inspired by T. rex, like Black Tyranno. In the anime series, this card was used by Rex Raptor and Tyranno Hassleberry.
- The Bahrag are twin queens of Bohrok Swarm, and they share more design cues with the T. rex than the Bohrok's beetle-like appearance, such as a giant set of jaws with sharp teeth, a therapod stance, and tiny two-fingered forelimbs.
- Rock Steeds are monsters resembling tyrannosaurs (down to the two-fingered forelimbs) used as mounts by the nomadic Bone Hunters.
- Choice of Games "Silverworld": "The Tyrant" is a monstrous dinosaur controlled by the False Icon.
- Chrono Trigger: While it's hard to tell on the overworld sprites (they look more like The Greys), the Reptites are meant to be sentient human-sized tyrannosaurs who managed to tame the fire-breathing Tyrannosaurus rex called the Black Tyranno, which can be found and fought several million years later as the Rust Tyranno.
- Dawn of War: The Tau's relic unit is the Greater Knarloc, a subspecies of Kroot that looks like the offspring of a terror bird and a T. rex with the temper to match. It's useful as a tough melee unit, but it's very slow to move and slower to turn.
- Fear & Hunger has the Greater Blight, a giant fleshy t-rex monster found in The Void, an endgame level for endings C and D. It will constantly chase the player down, with its approach signaled by ominous messages and loud footsteps. If the player fails to hide in one of the holes around the map, it will engage them in an inescapable battle where they're almost guaranteed to die.
- Final Fantasy VIII has the T-Rexaur, a dinosaur found on the plains of Balamb and in the Training Center. It's designed as a way to teach you two valuable lessons: sometimes it's better to run than fight, and that you can beat a brutish powerhouse easily with status effects.
- Fossil Fighters, a dinosaur-based mons series, features over half a dozen versions of T. rex as usable Vivosaurs, and they're all substantially different from the real thing due to their revival process. The basic version, known as T-Rex Sue in Fossil Fighters: Frontier, has red-black striped skin and mohawk-like fur running down its body, and is Fire-element. Others include a Super Evolved form that stands upright like how T. rex was originally speculated to stand, Boneysaur and Zombiesaur versions, and the Air-element T-Rex Stan. Tellingly, when actual T. rex appear late in Frontier, the contrast of them being Non-Elemental with realistic brown skin is apparent.
- Horizon Zero Dawn: In-universe. All the machines are based on animals, especially extinct megafauna. The most violent and dangerous is the Thunderjaw, which is clearly based on the T. rex. Since in-universe it's explicitly a robot only outwardly based on giant theropods, it has a number of divergent traits — besides being a full Armless Biped, it has jaw-mounted laser cannons, shoulder-mounted explosive disc launchers, and scanning equipment, so the designer wasn't too worried about artistic accuracy.
- Monster Hunter: Many monsters are based on T. rex:
- In the second generation there's Tigrex, the flagship monster of Monster Hunter Freedom 2, who has a T. rex-like head and reputation, as well as dinosaur-like blue stripes and a bronze-yellow hue in its skin, but is actually a Flying Wyvern. Later games add increasingly lethal variations, each being far stronger and more feral: Monster Hunter Portable 3rd introduces a subspeces (Brute Tigrex) which has a dark-green skin with black stripes, Monster Hunter 4 introduces a rare species (Molten Tigrex) that is colored dark red and is much bigger, and Monster Hunter Generations adds a Deviant (Grimclaw Tigrex) whose colors are more intense versions of the original and is considerably more powerful.
- The third generation introduced Brute Wyverns, a class of monsters characterized by bipedal stances, short forelegs, great physical bulk and strength, and heavy heads with strong jaws. The first you encounter is the Barroth, an insectivore that lives at the edges of deserts and covers itself in mud to protect itself from the sun while searching for anthills. Then there's Deviljho, who debuts in Monster Hunter 3 (Tri), and its variant Savage Deviljho, who debuts in the expansion Monster Hunter 3 Ultimate. Both monsters are Brute Wyverns with small arms and large heads, and extremely aggressive temperaments. They're also prone to repeatedly hunt preys to eat.
- In the fourth generation there's Glavenus, one of the flagship monsters of Monster Hunter Generations. It has T. rex-like traits while also drawing some others from Carnotaurus. It also has a massive blade on the end of it's tail, a firey spit, and the ability to combine the two by superheating the blade in its mouth. Monster Hunter: World Iceborne also provides a variant living in the Rotten Vale that secretes an acid from the tail that it uses to hone the blade.
- Monster Hunter: World: Anjanath resembles a cross between a T. rex and a vulture, with fire abilities. Iceborne introduces an electricity-based subspecies named Fuljur Anjanath.
- Mother 3: The Dragos are Tyrannosaurus-like creatures encountered on Mt. Oriander and the aptly named Drago Plateau. Unusually for T-Rexpies, they are normally very friendly, but then the Pigmasks appear and reconstruct one into the feral Mecha-Drago, causing Hinawa's death and the disappearance of Claus.
- Ninja: Shadow of Darkness: The boss of the cloud city level is a winged T. rex-looking monster. The dragon-like wings sticking out its back, combined with its tiny T. rex arms, make it look as ridiculous and awkward as it sounds.
- The fossil Pokemon Tyrunt, as well as its leveled-up counterpart Tyrantrum, are essentially Tyrannosaurus with the Pokemon touch to their design, with heavier armor, a few feathers, highly aggressive personalities and the ability to tear a car to pieces with their jaws.
- Although it looks a bit more like Godzilla, the Pokemon Tyranitar also draws inspiration from T. rex, as implied by both its English and French names.
- Koraidon, the box legendary of Pokémon Scarlet, is a prehistoric lizard-like dragon that's a mishmash of various dinosaurs, with its overall body plan in Apex Build vaguely resembling T. rex.
- Power Pete: The first department in the game features Radical Rex, an action figure based off a tyrannosaurus, as one of the enemy toys Pete must battle.
- Star Fox Adventures: The RedEye Tribe are a group of savage dinosaurs who clearly resemble Tyrannosaurus rex. Unlike other dinosaurs in the game, they act mostly animalistic, but they also wear crude bracelets and knee-rings, which indicates they are actually sapient.
- Super Mario Bros.: First introduced in Super Mario World, the Rex enemy looks like a indigo or violet T. rex (depending on the game) with a single nasal horn and tiny dragon wings on its back. They act like Goombas but can take two hits with their bodies becoming compressed on the first jump. While the normal variant doesn't appear in Mario & Luigi: Partners in Time, a Shroobified version of the Rex, known as a Shroob Rex, exists in Shroob Castle. They can Ground Pound, shoot boulders and breathe fire, and if not flattened at least once, are too tall to counterattack by jumping. All in all, they are tough enemies.
- Temtem: Tyranak is based on the T. rex, and the Tempedia describes it as a relic from prehistoric times. Judging from the names of its traits (Intimidator and Frightening), it seems to have a fearsome reputation. Unlike many examples, it has a few feathers; or rather, leaves that resemble feathers on its cheeks and tail. Also, befitting for a Temtem based on a creature that lived at the very end of the Cretaceous, it learns several techniques that involve meteors.
- World of Warcraft: Devilsaurs are dinosaurs that look like gigantic T. rexes with spikes on their back. They are the apex predators in several Lost World-type areas, such as Un'Goro Crater and Sholazar Basin. They are tameable by hunters with the Exotic Beasts talent, becoming powerful Ferocity-type hunter pets.
- Xenoblade Chronicles 1 and Xenoblade Chronicles 2 have the Sauros enemies. In the first game, they look vaguely draconic, can be found at very high levels in Makna Forest, and have a Talent Art where they eat a party member and inflict Instant Death on them. In the second game, they now take a more dinosaurian appearance and are mostly found in Temperantia, but a particularly nasty one can be seen roaming Gormott in the very early game and will happily one-shot the party if it sees them. Another monster in XC2, the Tyrannotitan Kurodil, is the strongest regular Optional Boss in the game and looks somewhat dinosaurian, but it's more of a Not Zilla despite its naming.
- Battle Kreaturez: Dravenger is a species of Battle Kreature which combines attributes of dragons and T. rex, complete with vestigial wings. Specifically, its design is heavily inspired by cheesy Off-Model vintage dinosaur toys, complete with bulging eyes and a gaping maw.
- Amphiterra: The Catastrophic Fraggon is a descendant of frog-like amphibians that fills the role of Tyrannosaurus, being a deadly apex predator. It's even the same size as a T.rex.
- Bosun's Journal: One of the Super Soldier species created in the Nebu-Kadn war was modeled after giant theropods in shape. In addition to being very physically intimidating, these soldiers could run at high speeds and absorb considerable physical punishment, and, while they lacked the sheer bite strength of a true tyrannosaur, they still had stronger bites than any natural primate. Their descendants after the war's end would become even larger, eventually topping out at around twelve meters in length and six in height, through sexual selection due to their preference for larger mates. They're also obligate carnivores, and, after the war ends in mutual destruction of the two sides, they sustain themselves through a combination of herding, hunting and raiding. After falling into nonsapience, they evolve into giant predators known as crushjaws, which dominate the deserts as apex predators challenged only by the equally large and powerful great dragon sphinxes, although the more numerous sphinxes eventually outcompete them.
- Hamster's Paradise: The original draft of the project had a species of large carnivorous hamster descendants resembling theropods evolve into a muscular nine-foot-tall predator called a tyrat which, as the name suggests, converged heavily on a Tyrannosaurus rex in niche and appearance. In the current canon, the apex predator of North Westerna in the Middle Temperocene is the pterowrex, a large, vaguely dinosaur-like biped that hunts mammoth-like herbivores called maustodons. Curiously, this is a case of Bizarre Sexual Dimorphism, as only the females are are T-Rexpy's: the male is a far smaller and flying species more akin to storks or azhdarchid pterosaurs.
- Neopets: There's a species of Neopet called the Grarrl, which heavily resembles a miniature T. rex with 4 fingers on each hand.
- Serina: On a number of occasions, some of the descendants of the canaries become adapted for life as large, flightless predators of megafauna. In the earlier periods of Serina's history, where the original avian form is still relatively unmodified, this results in forms reminiscent of the tyrannosaurs.
- The tyrant serins are enormous flightless apex predators with powerful bone-crushing beaks, wings reduced to vestigial appendages, and tail-like extensions of their pygostyles to balance their immense heads. They are mostly adapted for preying on the similarly flightless, elephant-sized serestriders, which they kill with guillotine-like bites to the neck.
- Coronas arise around forty million years later, and belong to a group that evolved a number of mammal-like traits such as fur-like feathers, liplike fleshy coverings over their beaks, and teeth. They're also huge, flightless bipeds — one ton in weight and ten feet tall — with tail-like hindquarters like the tyrant serins. Unlike the serins, their arms are large and muscular, and end in a single strong, hooked claw each.
- Sea rexes are an unusual case, as they're four-flippered, orca-like descendants of scaled seagoing birds adapted to prey on marine megafauna. The resulting creature resembles a heavily-built, shell-less sea turtle, with an avian head whose beak is filled with serrated keratinous teeth and built to crush the skulls and spines of other large marine animals. Sea rexes can grow to be sixty tons in weight and reach two centuries of life, and while their juveniles are vulnerable the adults are functionally impossible for other creatures to harm. Ultimately, however, they died out as a result of collapsing marine food chains killing off the large marine birds they eat, combined with a desperate effort by the sapient daydreamers to kill off their young in an effort to stave off their own extinction.
- Subjugators are a species of sawjaw — three-limbed terrestrial fish descendants who developed a single back leg from their tails, which secondarily became bipeds and turned their hind leg back into a tail — specialized for preying on megafauna. They're powerful, one-ton animals, adapted to run down prey and tear it to pieces. They'll prey on any large animal, but their favorite prey are huge quadruped birds convergently evolved to strongly resemble sauropods.
- Snaiad: The See-Rex is one of these, right down to the name. It's a giant, bipedal theropod-like predator inhabiting a Lost World of vaguely dinosaur-like creatures.
- In Ben 10: Omniverse, Khyber the Huntsman uses the Nemetrix on his hunting pet to transform into one of the many predators of Ben 10's alien forms. For Humungousaur, a giant dinosaur humanoid, its predator is a giant centipede-tyrannosaur hybrid known as Tyrannopede.
- In Filmation's Flash Gordon, some of the assorted giant monsters running around Mongo are of this type. Episode Two features a couple of them getting in a fight with each other.
- Schoolhouse Rock!: The eponymous "Tyrannosaurus Debt", a gigantic red-white-and-blue theropod that has taken up permanent residence on Capitol Hill in Washington D.C. and feeds off of taxpayer money. Every time the United States' national deficit increases, the Debt grows in size.
The debt's a monster problem
That we really can't ignore
I guess we should be grateful
That it's not a carnivore!
- The Scooby-Doo Show has the Snow Beast, an Arctic monster which resembles a Tyrannosaurus with a body covering of fuzz.
- Tyrannosaurus rex was the largest of its family, but it was far from the only type of tyrannosaur. Belonging to the Tyrannosauridae family. T.rex was one of roughly a dozen known species in a family which all shared some very similar traits; enough a layperson could certainly mistake its relatives for T.rex itself at a glance if they aren't familiar with the differences. Tyrannosauridae are all fairly large bodied theropods with short arms, two-fingered hands, and large-skulled predators found across North America and Asia. Of the group, Tarbosaurus and Zhuchengtyrannus most resemble T.rex as its closest relatives.