-->"You're a... '''girl''' dragon?"
-->--'''Donkey''', ''WesternAnimation/{{Shrek}}''

Ahh! A monster! A [[{{Squick}} squicky]] mess of [[CombatTentacles tentacles]] and [[ExtraEyes seventeen eyes]], a-and [[FangsAreEvil hideous teeth]] a-and his breath smells like sulfur and '''he opens his mouth!''' He's about to speak! He says: "I'm a she."

You see, in the mind of the audience (or at least in the mind of some characters) monsters are often initially assumed to be male. This trope covers situations when these characters are surprised to find out that the monster is, in fact, a female.

This takes the form of a monster in some way having her gender revealed, '''and''' someone acting surprised by this.

See also SamusIsAGirl, MonsterIsAMommy and YourTomcatIsPregnant.
----
!!Examples

[[foldercontrol]]

[[folder: [[Anime And Manga Anime and Manga ]]
]]
* Inverted in ''{{Slayers}}'' - A female-looking firebreather is revealed to be a [[IncrediblyLamePun "drag"-on]] despite TertiarySexualCharacteristics, when Gourry gets a good glimpse of the underside.
** A chapter of ''Manga/{{Naruto}}'' did pretty much the same thing with a giant armadillo whose gender Naruto and Killer Bee argued about trying to discover, except that [[{{Squick}} we ALL got a good look at its underside.]] '''[[BrainBleach TWICE]]'''
* Combined with SamusIsAGirl in ''MahouSenseiNegima'': unlike most examples the BountyHunter with the naughty tentacles actually ''was'' a CuteMonsterGirl, and it turned out the tentacles and stocky build were from a set of PoweredArmor she wore.

[[/folder]]

[[folder: Comics ]]

* In {{Popeye}}'s Plunder Island Arc, Wimpy is at one point dragged off of Popeye's ship and onto the Sea Hag by the monstrous Goon. Soaked from being in the ocean, Wimpy decides to take off his clothes while being held captive with the Goon watching him. Just as he's about to strip naked, a voice comes through the door, saying, "Keep a close eye on him, Alice." Wimpy quickly realizes who 'Alice' is, and quickly re-clothes himself, saying, "I didn't know there was a female present."
* In Creator/MarvelComics, Piranha (a normal piranha fish mutated by radiation into a semi-humanoid being) was always assumed to be male since the character's introduction in 1974. Even A.R.M.O.R.'s file on Pirnaha lists "male" under sex. In a 2009 comic it's discovered it's actually a female when the monster has incubated humans with its offspring.

[[/folder]]

[[folder: Film ]]

* In ''WesternAnimation/{{Shrek}}'', Donkey is confronted by a dragon on a collapsing walkway and attempts to smooth-talk his way out, before realizing that the dragon is female, and she thinks that he's hitting on her. [[InterspeciesRomance He goes with it.]]
* Everyone assumes that Kevin is a boy bird in ''WesternAnimation/{{Up}}''.
** Not unjustifiably-- with many bird species the colorfully-feathered one ''is'' the male. (Peacocks are the classic example.) Kevin's plumage is modeled on a (sadly recently deceased) male [[http://en.wikipedia.org/wiki/Himalayan_Monal Himalayan monal]] from the Sacramento Zoo.
** Kevin could still be male, even if he's raising babies, as there are several species of bird where the male does the childrearing.
* In ''Franchise/StarWars'', if the [[VideoGame/StarWarstheForceUnleashed video game]] is to be believed, the Rancor Luke fights in episode 6 is a female as well, as in the video game you fight a "Rancor Bull," which looks the same, only it has horns.

[[/folder]]

[[folder: Literature ]]

* In ''[[Literature/InheritanceCycle Eragon]]'', Eragon comes with a long list of names to suggest for his newfound dragon to call her. He lists quite a few, before figuring out that the dragon is female, and he'd only suggested male names thus far.
** Another instance is seen in ''Brisingr'' with [[spoiler: the Ra'zac.]] One is revealed to be female, while the gender of the other is left ambiguous.
* In ''[[Discworld/GuardsGuards Guards! Guards!]]'', the dragon tormenting the city is revealed at the last minute to be female, to the surprise of the city watch.
** "Chelonauts" in ''Discworld/TheLightFantastic'' are trying to go over the edge to determine the sex of Great A'Tuin, the turtle the Discworld travels on. Their mission is largely unsuccessful, but at the end of the book, the strange lights wizards have been seeing in the sky turn out to be Great A'Tuin's eggs, and hatch.
* In ''Literature/HarryPotter'', Norbert the Norwegian Ridgeback is in the last novel revealed to be a Norberta, to Hagrid's bafflement. According to Charlie, the easiest way to tell this is that female dragons are even more vicious.
* The title character in ''{{IT}}'' [[spoiler: is protecting Its eggs, which will assumedly hatch into MindScrew monsters just like her.]]
* Happens in ''{{Literature/Animorphs}}'' with the first free Hork-Bajir. "You mean there's such a thing as a female Hork-Bajir?"
* In the short story [[Literature/VorkosiganSaga 'Labyrinth']] Admiral Miles Naismith accepts the job of putting down a defector's SuperSoldier experiment, bungles the infiltration of his old lab badly enough for the guards to cast him into a basement to be devoured by said experiment, and... discovers a lonely teenaged girl.
* Dalinar Kholin realizes about halfway though ''Literature/TheWayOfKings'' that the [[HumanoidAliens Parshendi]] send their "femalen" into battle alongside the males. Note that for [[TheKingdom Alethi]] like Dalinar, a woman fighting is about as scandalous as that same woman having sex in public. With someone she's not married to.

[[/folder]]

[[folder: Live Action Television ]]

* In ''{{Reaper}}'' Nina starts giving Ben some compliments that perturb him coming from her rather masculine seeming demonic form. The later start dating, though mostly in her human form.
* Lorne's mother in ''Series/{{Angel}}'' was played by an extremely muscular, bearded man. Angel is comically baffled when Lorne goes, "Hi, Mom".
* The Horta in the ''Series/StarTrekTheOriginalSeries'' episode "The Devil in the Dark" turns out to be female...and the "silicon nodules" that miners on its planet are destroying turn out to be her eggs.
* A particularly horrifying example of this trope occurs in the Series/NightGallery episode "The Caterpillar". A man pays to have a romantic rival murdered by having a carnivorous earwig placed in the mans ear. The plan goes wrong, however, and the next morning he awakens too find that [[LaserGuidedKarma the earwig has been placed in his ear instead, and has crawled inside his head.]] [[FateWorseThanDeath He endures weeks of agony as the earwig eats its way through his brain]], but he remarkably survives the ordeal. He is then told by a doctor that the earwig was female... [[spoiler: And it laid eggs.]]

[[/folder]]

[[folder: Tabletop Games ]]

* One 2E supplement about the {{Dragonlance}} D&D setting had a section on minotaur society, complete with an in-character narrator who'd been captured by sea-going minotaurs. When this character asks the ship's captain about minotaur family life, the captain gruffly points out that the husky, wide-horned first mate who's been holding the narrator's hands behind his back throughout their conversation is, in fact, his wife.

[[/folder]]

[[folder: Video Games ]]

* The dragon Hooktail in ''[[VideoGame/PaperMarioTheThousandYearDoor Paper Mario: The Thousand-Year Door]]''. Despite the character being the first major boss of the story, you don't learn this until the final chapter--where [[BigBrotherInstinct her older brother]] is the first of ''[[BossRush many]]'' bosses, and is [[ItsPersonal predictably pissed off at you for what you did to his sister]].
** Even the characters assume Hooktail to be male, and refer to her using male pronouns.
* ''VideoGame/{{Psychonauts}}'' - Raz discovers that the lungfish residing at the bottom of the lake is actually "Linda". Although with the deep, booming voice, the audience can be forgiven for its assumption.
* [[spoiler:Shale the golem]] in ''VideoGame/DragonAgeOrigins''. Technically genderless in its current form, but it used to be a female dwarf.
* You know the Level 300-ish dragon that hangs around [[VideoGame/DisgaeaHourOfDarkness Laharl's throne room]] and [[spoiler: helps save your ass once]]? She'll have you know that she's one of the more attractive of her lot.
** ''Dark Hero Days'' features a lesser surprise in the form of Actress, a female Entei. It would've been more surprising if not for the fact that you can hear her obviously female voice in the battle that occurs prior to someone bringing up her gender.
* The hulking, muscle-bound Butcher enemies from ''DarkSouls'' are in fact female, according to the WordOfGod.
* In ''VideoGame/DuckTales Remastered'', [[spoiler: the Yeti boss of the Himalayas is shown to be a female.]]

[[/folder]]

[[folder: Web Comics ]]

* ''HannaIsNotABoysName'' has a vampire bat who [[http://hanna.aftertorque.com/?p=23 Hanna wrongly assumes is male]], and he seems to get more apologetic than she got offended when she corrects him. She has TertiarySexualCharacteristics upon closer inspection.
* ''Webcomic/TheInexplicableAdventuresOfBob''-- Upon encountering Nessie the [[StockNessMonster Loch Ness Monster]], Bob says he thinks she's a girl monster, because [[SecondarySexualCharacteristics she has eyelashes.]] Molly, being a monster herself, confirms that only girl monsters have eyelashes.

[[/folder]]

[[folder: Web Original ]]

* [[spoiler:Dodoria]] in ''WebVideo/DragonBallZAbridged''. [[spoiler: Vegeta is so disgusted he vaporizes her just to repress the memory (her [[WeCanRuleTogether proposal]] didn't help).]]
* Monster may be stretching the term slightly, but in the SCPFoundation, there is [[spoiler: Dr. Wondertainment]]

[[/folder]]

[[folder: Western Animation ]]

* The episode "Cammy Island" from TheMarvelousMisadventuresOfFlapjack has the titular hideous ogre turning out to be a girl, who is implied to, at least mentally, not be that much older than Flapjack himself.
* Subverted/Inverted with Bigfoot in ''WesternAnimation/TheVentureBrothers'' who [[TheSixMillionDollarMan Steve]] [[strike:Austin]] [[CaptainErsatz Summers]] [[InterspeciesRomance was in love with.]] After Brock shaves Bigfoot for the sake of a disguise, he reveals to the audience that he's actually male.
--> '''Steve''': What are you, shy? Sasquatch doesn't have anything you haven't seen before.
--> '''Brock''': Sasquatch ''is'' something I haven't seen before!
* ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'': The show itself seems to have a hard time concluding whether Jeff is a male giant spider or a female giant spider as he has been shown to lay thousands of eggs in two episodes but has a masculine voice and married the Spider Queen Velma Green. {{Lampshade}}d by Billy.
* ''GreenLanternTheAnimatedSeries'' has the main characters defeating a giant monster in what seems to be a gladiator-style fight (their [[UniversalTranslator translators]] are offline). However, then the spectators rush out to tend to the beast, and we hear them speak legibly for the first time.
-->'''Alien:''' What have you done to Mother?