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The Monstrous Nightmare, one of the more common species of dragon.

Dragons are the Barbaric Archipelago's (perhaps even Earth's) second dominant species, a race of powerful reptiles with two distinguishing characteristics: flight and fire generation (although not all dragons have both or either). Many have dragons have human companions.

How to Train Your Dragon (series)


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.


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.


Dragons have a few weaknesses. For one, they can be outsmarted by humans like Hiccup. Hiccup has done this many times, like with the Green Death and the Monstrous Strangulator. Also a lot of dragons can be controlled just by having a human yell at them. The biggest weakness perhaps is possibly the Dragon Jewel. The Dragon Jewel has the power to extenguish all dragons from the face of the earth, as inside the jewel, two dragons are present. One of the dragons is suffering from a extremely deadly disease to dragons.

Behavior and Personality

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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.

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.

They also love to play on fire since their skin is fairly fireproof, in some species even completely immune to it.


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.

Life Cycle

Dragons start out as an egg, and after hatching they grow.


From Hiccup's prologue and epilogue in How to Train Your Dragon as his epilogue in How to Fight a Dragon's Fury, that, by the time he is old, most of the dragons have gone into permanant hiding in the northern waters.

Dragon Species of
Book Logo
Cave Dragons
BrainpickerDriller-DragonEight-Legged NadderDeadly NadderElectricstickyFlamehufferGlow-wormGronckleRed-Hot ItchywormRiproarersSkullionSlugbulbsStickywormMonstrous Strangulator
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
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 Class
Bloody CrocoraptorBlubberwingBurrowing SlitherfangDimbruiserEagleflyFire DragonGiant DeathwatchGoreblufferGorgenghastGreater PricklepineHellsteetherLackwitLesser Blackbacked SeadragonLesser-Spotted SquirrelserpentLoafer DragonNanodragonPricklepinesPuff NadderRageblastsReptoSand RattlerSandrazorSky DragonSlugblobSticky StealerSwiftgliderToothless DaydreamUnderground Tail-HunterWater DragonWhite Dragon'X' Dragon

How to Train Your Dragon (Franchise)


Dragons come in many different shapes, colour and sizes.

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 lizard-sized Fireworm to the gargantuan Bewilderbeast.

Some dragon species can have different colored scales amongst individual specimens (such as the Deadly Nadder, Gronckle, Monstrous Nightmare, Hideous Zippleback, and the Thunderdrum etc.) while some retain the same color throughout their breed (such as the Night Fury and the Snow Wraith etc.) Most dragons change their colour in their Titan Wing stage in Dragons: Rise of Berk. Some lead individuals, take for example the Night Terrors and Speed Stingers, have different colours with their social rank. The lead Terror is white instead of black like the rest and the lead Stinger has a red crown and stripes. See Also: Color Varieties


See Also: Dragon Anatomy

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, Hotburple and the Catastrophic Quaken) 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 while others (such as the Bewilderbeast, Shivertooth, Groncicle, Woolly Howl and the Snow Wraith) are able to cool water down or produce ice.  

They have different types of firepowers, ranging from fire to ice, sonic sounds to acid. See Also: Fire Types


While the natural diet of most dragons is fish, they will happily eat other things, such as vegetables, and man-made food like bread. Most dragons, however, eat fish like Mackerel and Atlantic Cod and sometimes, other forms of meat. The Monstrous Nightmare and the Changewing have been shown hunting wild boars. The Whispering Death also enjoys eating sheep, so it may be that at least some of the other larger, land-based species do also. The Typhoomerang enjoys eating eels,The Skrill likes sheep and the Deadly Nadder likes chicken. Some dragons like the Red Death, Scauldron and Deathsong eat other dragons. Some dragons even eat invertebrates and small animals as shown by a Raincutter eating grubs and the Razorwhip enjoying Sea Slugs. 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. The trained dragons on Berk will not hunt farm animals, but they will accept their cooked meat if given to them by humans.

Dragons also enjoy vegetables and plants. Deadly Nadders have been shown feasting on a type of bush or shrub. The Flightmare eats algae suspended in water, which other dragons can also eat. The Scauldron enjoy the Blue Oleander Flowers that give its species venom. Dragon Root and Dragon Nip, are plants that dragons eat. The Dragon Root is loved by dragons and can make them wild and fight over it. Only the Gronckle is immune to it. The Dragon Nip, on the other hand, soothes the wild dragons. The Monstrous Nightmare has been shown eating corn.

Some can also eat other substances, such as the Gronckle eating rocks for food and to convert to the lava they fire and the Hotburple eats metal ores. The Gronckle can produce a variety of lava or metals after eating different rocks. Such as lava rocks, Gronckle Iron, magnets, different coloured lava and a transparent material. Snafflefangs enjoy eating geodes.Toothless has been seen snatching bread from Hiccup, though he did not eat it, the very fact that he wanted it shows that dragons could have eaten bread.

Predators and Weaknesses

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. Most species have a fear of eels, a limited number of 'shots', and a blind spot.  

Behavior and Personality

Dragons are social animals, living in large colonies with their own kind and other dragon species. A large dragon like a Red Death or Bewilderbeast normally controls the nest as an alpha. Alphas control dragons either by earning their trust and loyalty by protecting them or scaring them, into submission.They gather together to mate and lay eggs. These behaviors have also moved on to other species such as humans, as well as domesticated animals like sheep, cattle and chickens, thanks to the training and semi "domesticating" of dragons. It is unknown whether they mate for life or not. Some dragons like the Flightmare, however, prefer hunting and living alone.

The average trained dragons are loyal to their owners and most will protect them when they are in danger. They will do anything to earn their trust and will not leave them.

Life Cycle

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.

Egg: Dragon eggs come in a wide variety of shapes, size and colour, all of which help the egg survive better. Some of which even explode when hatching. Dragons on Berk head to The Berkery every Snoggletog to lay eggs. See Also: Dragon Eggs.

Tiny Tooth: Also known as the hatchling or baby in Rise of Berk, these dragons are small and appear adorable. See Also: Baby Dragons

Short Wing: Also known as the juvenile or teen stage in Rise of Berk, these dragons are slightly smaller than their full grown size. They start to develop traits and characteristics of their species, but their firepower may be weaker. For example, juvenile Speed Stinger venom only paralyses some body parts instead of the entire body and for a shorter time.

Broad Wing: These adults are fully grown and have developed all traits of their species.

Titan Wing: Titans are the rarest stage of dragons, they are physically faster and stronger than their younger counterparts. They have different colours and more body parts like spikes and barbs in Rise of Berk. They are significantly larger and may tend to bully younger dragons, as seen in Total Nightmare. Though Titans may have the upper cut, it does not mean that they are undefeatable. They are less agile due to their size and can be defeated by several adults. They are still powerful dragons.


Based on comments by Dean DeBlois, just like in the books the dragons in the franchise share the same fate, as they all go into hiding.

Dragon Species of
How to Train Your Dragon logo
Strike Class Symbol
Night FurySkrillSnow WraithThreadtailTriple StrykeWoolly Howl
Stoker Class Symbol
FirewormHobblegruntMoldruffleMonstrous NightmareNight TerrorSingetailTerrible TerrorTyphoomerang
Tidal Class Symbol
BewilderbeastPurple DeathSand WraithScauldronSeashockerShockjawSliquifierSubmaripperThunderdrumTide GliderWindwalker
Boulder Class Symbol
Catastrophic QuakenEruptodonGrapple GrounderGroncicleGronckleHotburpleScreaming DeathShovelhelmSnafflefangThunderpedeWhispering Death
Sharp Class Symbol
Devilish DervishEgg BiterHackatooPrickleboggleRaincutterRazorwhipScuttleclawShivertoothSpeed StingerStormcutterThornridgeTimberjackWindstriker
Mystery Class Symbol
ArmorwingBoneknapperBuffalordCavern CrasherChangewingDeath SongFlightmareForeverwingGobsuckerHideous ZipplebackSlithersongSmothering SmokebreathSnaptrapperSweet DeathSword Stealer
Tracker Class Symbol
Deadly NadderMudrakerRumblehornSnifflehunchThunderclawWindgnasher
Unknown Class Symbol
StingerUnknown Dragons


  • The dragons in the books differed from the ones in the movies and series on many 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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