[[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 ''[[UsefulNotes/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 ''[[UsefulNotes/StockDinosaursNonDinosaurs 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 ''Ankylosaurus'' 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)]].

A second film 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.]]
** This is actually happier than the book, [[spoiler: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".
* CartoonCreature: The tree-climbing creature that warns Heart and Light about the Big Jaws, which resembles a reptilian sloth with horns and chameleon-like eyes. Other unknown creatures include a trio of what appear to be reptilian goats, and a flock of scavenging pterosaurs that resemble vultures.
* CharlesAtlasSuperpower: Heart trains and practises martial arts to the extent that he's easily one of the strongest characters aside from Baku, capable of doing one-finger push-ups and leaping high enough to kick a ''sauropod'' in the head.
* 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 or even move, so he leaves Umasou alone. He's sessile that he has berry plants growing on him.
* 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 that [[spoiler:Baku is his biological father]], even though Beckon notes the StrongFamilyResemblance between them 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 PredatorsAreMean, 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.
* InformedSpecies: 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:
** A strangely demon-horned carnivore, which is supposed to be the ''Chilantaisaurus'' from the book, but just looks like some kind of demon.
** The ''T. rex'' in the film walk upright, have short rounded snouts, and have a row of spines running down their backs making them look like a bizarre cartoony {{Expy}} of Franchise/{{Godzilla}}.
* InterspeciesAdoption: Two generations of it! Heart is a ''T. rex'' who was adopted by a ''Maiasaura'', and who later adopts a baby ''Ankylosaurus''.
* 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.
* OverlyLongTongue: Pero Pero the ''Elasmosaurus'' gets her name from the Japanese onomatopoeia for "lick", and [[MeaningfulName fittingly has a very long tongue]].
* 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.]]
* PredatorsAreMean: 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 above), the carnivores are simply hunting to survive.
* RaptorAttack: The nest-raiding ''Troodon'' from the beginning of the film. Heart also chases a pair of raptors to inquire if they've eaten Umasou.
* 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, and in the movie as the purple horned carnivore trying to eat Umasou. The film also features ''Avisaurus'', ''Ornithocheirus'', and titanosaurs. ''Maiasaura'', ''Troodon'', and ''Giganotosaurus'' also qualify to some extent. A ''Gorgosaurus'' appears in episodes 16 and 17 of the animated series.
* SingleStrokeBattle: When Heart and Gonza face off for the last time, [[spoiler:they lunge past each other. Heart tears a chunk of Gonza's neck out, mortally wounding him, and is himself uninjured]].
* 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.
* StrongFamilyResemblance: When Baku stops by to leave him food, Beckon notes that Heart resembles Baku when he was younger and speculates that Baku's long-lost egg may have been saved. While Baku never informs Heart of their relationship, [[spoiler:the mother ''Maiasaura'' realizes Baku is Heart's father after he scolds her for how she raised him, then thanks her for nevertheless keeping Heart alive]].
* TyrannosaurusRex: Both our core protagonist and several of his most persistent antagonists are all ''T. rexes'', referred to as 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.