[[caption-width-right:300:"Umasou is a great name! But what does it mean?"]]
''You Are Umasou'' (''Omae Umasou da na'') is a 2010 Japanese animated feature film based on a Japanese children's book series of the same name by Tatsuya Yamanishi, published by Poplar.

The film follows a ''{{Tyrannosaurus rex}}'' named Heart who was raised by a ''Maiasaura''. Realizing he was different, he ventures out to find where he belongs. One day, Heart finds a baby ''[[StockDinosaursTrueDinosaurs Ankylosaurus]]'' who mistakes him for his father, accepting "umasou ((you) look delicious)" as his actual name. Originally intending to eat him, Heart comes to be genuinely concerned for Umasou's wellbeing as a familial bond develops between the two.

There is also a series of five-minute shorts lasting 20 episodes with every five episodes being an adaption of a book, all of them staring a male ''{{Tyrannosaurus rex}}'' which is most likely not the same dinosaur. The first story is about the protagonist's relationship with Umasou. The second one is about the protagonist's relationship with[[spoiler: an unnamed Elasmosaurus (named Pero Pero in the film)]]. The third story is about the protagonist, Heart. The fourth story is about the protagonist's relationship with[[spoiler: 5 baby Ankylosauri and their relationship with each other]]. The third one is the only one of the 4 stories where the protagonist is named. The film is essentially a combination of the first three stories retold with unaddressed issues being bought up [[spoiler: (like how a Tyrannosaurus need to eat meat to live)]].

[[http://gonom.kr/ A second film]] distributed by Korea has been announced and was released in July 2015.

For similar carnivore/herbivore antics, see ''Literature/ArashiNoYoruNi''.

!! The film contains the following tropes:
* AnimalJingoism: The opening features ''Troodon'' raiding the ''Maiasaura'' nesting grounds. And then there's the battle between the ''Tyrannosaurus'' pack and the ''Triceratops''.
* AntiVillain: One-eyed Baku is the leader of the Big Jaws and a WorthyOpponent to the protagonist. He's frequently shown being respectful towards Heart and once saved the land from "gluttonous long necks from the south", but when Heart and the Big Jaws start fighting each other, Baku is forced to take action against him.
* AnxietyDreams: Heart has them throughout the movie. They're pretty screwed up.
* ArtisticLicensePaleontology: It's meant to be an entertaining movie, not a biologically accurate one.
* AwardBaitSong: [[http://www.youtube.com/watch?v=--NFJpAZ5nc "Kimi to Irou Jikan no Naka De."]] It's even particularly Disney-esque, instead of anime-esque.
* BigBrotherInstinct: Light was born a few seconds before Heart and took care of his little brother when they were children, even going so far as to try and protect Heart with his own body when they were attacked by Gonza. After he's grown up, he seems to be this as well to his other three younger siblings born from a different brood of eggs.
* BittersweetEnding: While [[spoiler: the volcano eruption]] doesn't harm anyone, [[spoiler: Heart can't really stay with his mother and siblings. He continues to live with Umasou, mostly alone.]]
** [[spoiler: And this is actually happier than the book, where Umasou ends up going back to his real parents because Heart can't guarantee his safety.]]
* CallARabbitASmeerp: "Big Jaw" for ''Tyrannosaurus'', "Hard Shell" for ''Ankylosaurus'', "Three Horn" for ''Triceratops'', and "Big Jaw of the sea" for mosasaurs. Strangely, ''Giganotosaurus'' are referred to as "Gluttonous ''Long Necks'' from the south".
* CarnivoresAreMean: Played straight and subverted. The young Big Jaws are bullies, but Baku appears to be offering food and shelter to baby Heart when he thinks the latter has been orphaned, later stating that he was "skin and bones" at the time, and only exiles Heart to protect the rest of the Big Jaws. And then of course there's Heart himself who, while a competent hunter, tries his best to act mean yet fails miserably. Just like the herbivores being willing to kill in self-defense (see HerbivoresAreFriendly below), the carnivores are simply hunting to survive.
* CartoonCreature: The dinosaurs in this movie aren't particularly realistic-looking, to the point where it's hard to figure out what some of them are. In particular is a strangely demon-horned carnivore, which according to WordOfGod is a ''Chilantaisaurus'', but just looks like some kind of demon.
** The ''T. rex'' in the film walk upright have short rounded snouts, and have dorsal fins running down their backs making them look like a bizarre cartoony {{Expy}} of Franchise/{{Godzilla}}.
* ChekhovsGun: [[spoiler: When the land slightly gives way as Heart steps on it while looking for his mother - the same spot she later falls from]].
** Also could be [[spoiler: the focus on making his little arms stronger, when he later needs to pull his mother back up the cliff]].
* ChildrenRaiseYou: Heart matures by looking after Umasou.
* CoolOldGuy: Beckon, the old ''Tyrannosaurus''. He's too old to eat solid food, so he leaves Umasou alone.
* CrystalDragonJesus: Somewhat. They're shown (particularly the mother) praying to the Egg Mountain.
* DeathOfAThousandCuts: [[spoiler: Heart employs this strategy in his fight against Baku, at least before [[LetsGetDangerous the gloves come off]].]]
* DramaticIrony: Heart never finds out who Baku really is, even though it becomes obvious to the audience relatively early on.
* DumbDinos: Averted - both herbivores and carnivores are sapient and can speak.
* EatTheDog: Heart initially plans on doing this with Umasou, but he ends up unable to resist the cute little guy.
* EvenBadMenLoveTheirMamas
* FamilyUnfriendlyDeath: Some of the violence in the film is tame; however, many of the tyrannosaurs are shown killing other dinosaurs on screen, ripping them open and devouring flesh and guts, which mostly just looks like pink bubblegum. There's little blood.
* FluffyTheTerrible: A ''T. rex'' named Heart is hard to take seriously. [[GentleGiant Of course,]] [[JerkWithAHeartOfGold it IS fairly accurate.]]
** Umasou qualifies as well, assuming when he becomes a full-grown ''Ankylosaurus''.
* FunnyAnimalAnatomy: A ''Chilantaisaurus'' with bull horns. Even though no skull material of the carnosaur have been discovered yet, it is still pretty outlandish.
* GoodParents: Heart and Light's mother. Helps that she is a ''Maiasaura'', [[FridgeBrilliance whose name actually translates to "good mother lizard"]].
* HappilyAdopted: One of the main thrusts of the movie. Heart was adopted by a plant-eater, and he adopts Umasou (another plant-eater) in turn. All of whom are pretty happy with the situation.
* HardWorkMontage: Heart and Umasou are shown doing various types of training, including agility, headbutting, striking down trees and roaring, all to the tune of "Jump Kick, Tail Smash". Doubles as a TrainingMontage, since Heart is preparing Umasou to fight if something tries to eat him.
* HerbivoresAreFriendly: Just like CarnivoresAreMean, the film shows two sides to this. Heart's adoptive mother and brother are some of the kindest characters in the movie, and little Umasou goes out of his way to find food that both he and Heart can eat. However, almost everyone is shown to be willing to kill if it is necessary. Among a few other examples, Heart's mother tramples a ''Troodon'' to protect her eggs, and the leader of her herd nearly does the same to Heart when he's just a hatchling.
* InterspeciesAdoption: Two generations of it!
* IronicNurseryRhyme: "Big Jaw," first introduced into the film as a lullaby sung by a giant sloth mother, is about how Tyrannosaurus will hunt you down and eat you if you cry.
* LighterAndSofter: Despite its FamilyUnfriendlyViolence, the tone of the movie never really wavers.
* MeaningfulName: Heart is a pretty soft-hearted dinosaur, no matter how much he tries to look tough. [[spoiler: Later in the movie, when Heart is carrying an injured Umasou in his mouth, we see the outline of Umasou in his mouth, and the shape of his heart beating in his chest.]]
* NamesToRunAwayFromReallyFast: One-Eye, or Baku, the alpha Big Jaw. Three times the size of Heart and the younger Big Jaws, he rules his pack by tooth and claw, and most of the time, Heart shies away from actually fighting him. [[spoiler: Until the very end, when it's his Maiasaur family on the line.]]
* NonActionGuy: Light, Heart's childhood friend and "brother". He is a plant eater, so he doesn't have any of the raw strength that Heart possesses, and is almost completely unremarkable.
* PapaWolf: Heart becomes increasingly protective of Umasou as the movie progresses, despite only seeing him as "tasty-looking" at first. [[spoiler: When Gonza and the other Big Jaws try to eat Umasou, Heart flips out and attacks all of them - which leads to him being forced into exile for his crimes.]]
* RaptorAttack: The nest-raiding ''Troodon'' from the beginning of the film.
* RefugeInAudacity: Not so much the on-screen predation as the depiction of a pleisiosaur as something ''cute and eccentric,'' which Pero Pero certainly qualifies as.
* RidiculouslyCuteCritter: Umasou. He's so cute that Heart confusedly starts talking to him as if he was his own son only a few seconds after seeing him.
* SeldomSeenSpecies: A ''[[http://en.wikipedia.org/wiki/Chilantaisaurus Chilantaisaurus]]'' showed up in the second episode of the animated series. Also in the movie as the purple horned carnivore trying to eat Umasou. There's also ''Avisaurus'', ''Ornithocheirus'', and titanosaurs. ''Maiasaura'' also qualifies to some extent.
* SoundtrackDissonance: In one of the more violent scenes in the movie, Heart beats several other Big Jaws unconscious while a nursery rhyme plays in the background.
* TyrannosaurusRex: Both our core protagonist and several of his most persistent antagonists are all Big Jaws.
* UnnamedParent: Heart and Light's mother.
* VegetarianCarnivore: Heart, at first. When he finds out he actually enjoys the taste of meat, he's horrified since he thought he was a herbivore.