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Dragons are Berk's (perhaps even Earth's) second dominant species, a race of powerful reptiles with two distinguishing characteristics: flight and fire production (although not all dragons have both/either).

In the movies

See Also: Dragon Anatomy

Most species have a fear of eels, a limited number of 'shots', and a blind spot. Most dragons also have protruding teeth from their lower mandible. Within the species, there are many different breeds, ranging in size, shape, color, and abilities, from the bug-sized Fireworm to the gargantuan Bewilderbeast

Dragons Size Comparison

A size comparison of all the known/named dragon species in the movie franchise

Some dragon species can have different colored scales amongst individual specimens (such as the Stormcutter, Deadly Nadder, Gronckle, Monstrous Nightmare, Hideous Zippleback, Rumblehorn, Hotburple, Typhoomerang, Snaptrapper, and the Thunderdrum) while some retain the same color throughout their breed (such as the Night Fury, Scauldron, Skrill, and the Timberjack.)

They are most likely warm blooded, strong evidence of that is obviously the fact they live up in the cold north and also with some species (such as the Gronckle, Scauldron, and the Hotburple) being able to take in things from their environment like geological minerals and water and produce enough internal heat to melt and/or boil the materials. The Book of Dragons shows that there are rumored five stages in a dragon's growth: Egg, Tiny Tooth, Short Wing, Broad Wing, and the incredibly rare Titan Wing. 

While the natural diet of most dragons is fish, they will happily eat other things, such as vegetables, and man-made food like bread. The Monstrous Nightmare and the Changewing have been shown hunting wild boars, so it may be that at least some of the other larger, land-based species do also. The Flightmare eats algae suspended in water, which other dragons can also eat. The trained dragons on Berk will not hunt farm animals, but they will accept their cooked meat if given to them by humans. Some can also eat other substances, such as the Gronckle eating rocks for food and to convert to the lava they fire, and the Scauldron enjoy the blue oleander flowers that give its species venom. During the war with the dragons, it is fairly clear that they were also willing to prey on humans, as a Monstrous Nightmare swallowed Gobber's arm and enjoyed it. 

Dragons have three major predators: healthy adults can be in danger from rival dragons and humans, and wild boars prey on young and injured dragons. 

Dragons are social animals, living in large colonies with their own kind and other dragon species. This behavior has also moved on to other species such as humans and domestic animals such as sheep, cattle and chickens thanks to training and semi "domesticating" of dragons. 

List of dragons by class
Stoker FirewormHobblegruntMonstrous NightmareRed DeathTerrible TerrorTyphoomerang
Boulder Grapple GrounderGroncicleGronckleHotburpleScreaming DeathSnafflefangThunderpedeWhispering Death
Tracker Deadly NadderRumblehorn • Thunderclaw
Sharp HackatooRaincutterScuttleclawShivertoothSpeed StingerStormcutterTimberjack • Windstriker
Tidal BewilderbeastDesert WraithSand WraithScauldronSeashockerShockjawSliquifierSubmaripperThunderdrumTide Glider
Mystery BoneknapperChangewingFlightmareHideous ZipplebackSmothering SmokebreathSnaptrapperSweet DeathSword Stealer
Strike Night FurySkrillWoolly Howl
Unknown Egg BiterGobsuckerStingerUnknown HTTYD 2 Dragons

In the books

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Dragons in the books are described as being very sneaky selfish creatures who are never thankful of anything and will only obey to brute force and yelling. Most dragons pride themselves on this fact and will easily abandon their masters as soon as danger is on sight. Most dragons have a proud nature, often referring to themselves as aristocrats and green-blooded. Like cats, dragons have a cruel streak, and they like to play with their food before they kill it. They also love to play on fire since their skin is fairly fireproof, in some species even completely immune to it.

In Berk many of them live as babies in the dragon nursery, a cave where they hibernate together. While hibernating a dragon enters into a very deep coma. Some dragons, however, don't hibernate and they are called 'evergreen' dragons. Dragons have three eyelids which they can open at will when sleeping. Only when all three are open the dragon is fully awake. Dragons communicate with each other in a language known as Dragonese. This language is specially hard for humans to speak since humans don't have forked tongues. Dragonese is punctuated by shrill shrieks and popping noises, and sounds. The word "pishyou", when spoken by a human, for example, is pronounced very much like a sneeze.

A dragon's diet consists mostly of meat, but they are supposed to eat plenty of vegetables and, weirdly, lots of wood, like small branches, twigs and the bark of trees. This helps them with their firebreathing. A dragon that can't breath fire gets very sick and eventually explodes.

Most dragons are four legged with a pair of wings and firebreathers. The fire from a dragon comes from two particularly small, almost undetectable holes in a dragon's throat. From these holes, it releases a breath heavy in oxygen and extremely flammable. This gives the dragon the ability to not only breath fire but to do it underwater (since the oxidizer component is present in the breath itself). A dragon may choose not to ignite its breath, and due to its oxygen rich nature, it can be inhaled by a human. Dragons are also capable of living underwater as they have gills behind their horns that allow them to suck the oxygen in the water. Most dragons live on land though. Their size and coloration varies depending on the species. The smallest dragons are the bug sized nanodragons with the biggest being the Seadragonus Giganticus Maximus. A dragon's gaze is said to be hypnotic, a staring contest with Toothless once made Hiccup very dizzy and he was just a baby. Their eyes also shine in the dark.

Dragon's intelligence greatly varies in the books and it seems to depend on the species. Some dragons like the Monstrous Strangulator are shown to be stupid enough to be easily tricked into killing themselves, while others like the Seadragonus Giganticus Maximus are proud, intelligent creatures who love riddles and have been known to speak philosophically about abstract concepts like death.

It is known, from Hiccup's introductory note in How to Train Your Dragon, that, by the time he is old, dragons will be disappearing so fast they would soon become extinct. The reason for this is unknown.

List of dragons by class
Cave Dragons BrainpickerDriller-DragonEight-Legged NadderDeadly NadderElectrictickyFlamehufferGlow-wormGronckleRed-Hot ItchywormRiproarersSkullionSlugbulbsStickywormMonstrous Strangulator
Tree Dragons BreathquencherBullingdozerCuckoo DragonDreamserpentFirestarterGiant Bee-EaterPoison DarterRed TigerScarerShortwing SquirrelserpentVampire DragonVampire spydragonWolf-Fang
Bog Dragons Arsenic AdderwingBasic BrownBig Spotted GormlessCommon or GardenEight-Legged BattlegoreFlashfangFlying GatorHypnomunkLong-Eared Caretaker DragonMarsh TigerMonstrous NightmarePoisonous PifflewormRhinobackSidewinderSquealerStinkdragonToxic NightshadeVenomous Vorpent
Nanodragons CentideleDrowsy-Tipped DragonmouseElectricsquirmEmporor Beetleboog BolderbugFlutterfireLong-Eared FlutterfirePlankenteeniePrickleboggleTiddly-Nip Tick-Botherer
Mountain Dragons Bullguard SlavedragonDeadly ShadowTripleheader RageblastExterminatorGloomerGrimlerBullpuffHogflyMurderous DragonMood-DragonPuggleRaptortongueRazorwingSniffer DragonSnub-Nosed HellteetherSpecklehoundStealth DragonHorrorsTonguetwister
Sky Dragons BullrougherChickenpoxerTwo-Headed GormatronDevilish DervishRavenhunterRocket RipperSilver PhantomWindwalkerZebramount
Sea Dragons Brainless Leg-RemoverDarkbreatherDoomfangDreaderGolphinLeviathorganMonster of the Amber-SlavelandsPolar-SerpentSabre-Tooth Driver DragonSavagerSeadragonus Giganticus MaximusSharkwormThor's ThundererWinterflesherWoden's Nightmare
Unknown/No Class Bloody CrocoraptorBlubberwingBurrowing SlitherfangDimbruiserEagleflyFire DragonGiant DeathwatchGoreblufferGorgenghastGreater PricklepineHellteetherLackwitLesser Blackbacked SeadragonLesser-Spotted SquirrelserpentLoafer DragonNanodragonPricklepinesPuff NadderRageblastsReptoSand RattlerSandrazorSky DragonSlugblobSticky StealerSwiftgliderToothless DaydreamUnderground Tail-HunterWater DragonWhite Dragon'X' Dragon


  • The dragons in the books differed from the ones in the movies and series on most occasions.
  • In the game, Dragons: Rise of Berk, the dragons can be trained further by Valka to allow them to change to the final stage of a dragon's growth, the Titan Wing.
    • It can be observed that, apart from growing in size, the color of the dragon's scales greatly changes, with only a few parts of its body unchanged.

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