Dragons are a powerful reptilian species with two distinguishing characteristics: flight and fire production (although not all dragons have both/either). Most species have a fear of eels, a limited number of 'shots', and a blind spot. Within the species, there are many different breeds, ranging in size, shape, color, and abilities from the cat or dog sized Terrible Terror to the enormous Timberjack, which may be a myth, to the Green or Red Death or even the hideous Boneknapper. Some Dragon species can have different colored scales amongst individual specimens (such as the Terrible Terror or Monstrous Nightmare), while some retain the same color throughout their breed (Such as Gronckles or Deadly Nadders). They are most likely warm blooded like dinosaurs were, strong evidence of that is obviously the fact they live up in the cold north and also with some species such as Gronckles and Scauldrons, being able to take in things from their environment like rocks and water and produce enough internal heat to melt and/or boil the materials. The Book of Dragons shows that there are five stages in a dragon's growth: Egg, Tiny Tooth, Short Wing, Broad Wing, and the rarely seen Titan Wing.
While the natural diet of dragons is fish, they will happily eat other things, such as vegetables, and man-made food like bread. They will not hunt farm animals, but they will accept their cooked meat if given to them by humans. They can also eat other substances, such as Gronkles eating rock to convert to the lava they fire, and Scaldrons enjoy the blue oleander flower, which is poisonous to other dragon species.
Dragon's have 3 major predators, healthy adults can be in danger from rival dragons and humans and wild pigs prey on young and injured dragons.
Types of Dragons
A Basic Brown dragon only appears in the How to Train your Dragon cheese
. These herbivores are a medium-sized dragon and look similar to a Common or Garden dragon. In the books, Hiccup fails to capture a dragon and Fishlegs tries to lend him his. It is closely related to the Shih-tzu.
Blubberwings are a heavy-looking dragon related to the Gronckle. The Blubberwing stores fat in its wings for warmth and in case of food shortage. It can only fly to a height of 5 feet. They project large fireballs and extremely hot gas.
The Boneknapper dragon appears in the film and the animated short Legend of the BoneKnapper Dragon. This dragon is described by Gobber the Belch as "a disgusting, foul beast wearing a coat of stolen bones like a giant flying skeleton." In the film, the dragon only appears in a picture in the Dragon Manual when Hiccup is researching information about Night Furies and reveals that they are classified in the Mystery class. In the animated short, a Boneknapper is shown to have been searching for Gobber for his missing bonepiece needed to complete his bone armor.
A Bullrougher is only mention in the book series and was said that Gobber owned one. A Bullrougher normally lives in grassy mountains and caves. Like most dragons, this Gronkle-sized dragon can fly and use fire fairly well.
The huge Burrowing Slitherfang dragon appears in the books and the film and was predicted to be responsible for mysterious disappearances of vikings in the Isle of Berk. The dragon is also described to be large.
The Changewing was mentioned in the film when Hiccup is shuffling through dragon of the Mystery Class and in the exclusive short, Book of Dragons. A Changewing has unique characteristics including spitting acid instead of breathing fire and having perfect camouflage. They could also have the ability to hypnotize their victims using their eyes.
A Chickenpoxer dragon was said to appear like a mixture between a Gronkle and a Monstrous Nightmare.
A Common or Garden Dragon are only mentioned in the books and are described to be the most common dragons, hence their name. In the books, Toothless is a Common or Garden dragon owned by Hiccup.
Cuckoo Dragons are give birth to young similar to a regular bird. The Cuckoo Dragon only appears in the book A Hero's Guide to Deadly Dragons.
The Darkbreather dragon only appears in the How to Train your Dragon series (books) and has unique hunting strategies. Darkbreathers live in waters and captures their prey from the bottom of the ocean and pulling it downwards to feast on their blood.
A Deadly Nadder appears in the film adaptation and is one of the only bipedal dragon species mentioned. The Deadly Nadder resembles a bird by their body's shape, their posture, and the way they walk and fly. During a dragon training session, Gobber mentioned that you must stay in their blind spot which is located right in front of their nose. They are described to be one of the most beautiful dragon in Berk. They can fly fairly well and breathe super hot fire made of pure magnesium.
- "He or she has raptor-liked tendencies and is very alert. He or she is also highly curious and aggressive." - Dean DeBlois, co-writer and co-director of How to Train your Dragon.
In the movie, Astrid owns a Deadly Nadder named Stormfly.
They are also mentioned rapidly in how to speak dragonese.
The Devilish Dervish dragon is owned by Snotface Snotlout in only the book. These dragons are incredibly strong when lifting objects...
A Dreamserpent is a dragon that is absolutely transparent with no organs seen to be present. A Dreamserpent gets their name from travelling into a hosts dreams creating dreams or even nightmares...
A Driller-Dragon is a dragon that has a "drill" for a nose. Driller-Dragons only appear in the books. Driller-Dragons is also described to have unusual teeth and talons.
Doomfangs are a serpent-like sea dragon only mentioned in the books. They seem to possess a strange bluish fire that freezes their victim instead of burn them.
Hence the name, an Electrisquirm is an electricity conducting dragon that's is fairly small in size. This dragon only appears in the books and their entire body is electrical except their tail...
Exterminator dragons are exceptionally dangerous dragon who's appearances are only in the books. An Exterminator has long sword-length talons and is large in size.
Fire dragons are dragons that are only mentioned in the books. Even at early birth, they are known to feast on Exterminator dragons (above). These dragons are extremely feared...
Flashfangs are dark colored dragons that only appear in How to Speak Dragonese. In the books, Flashfangs were part of the Roman Colosseum show.
The Fleshfang dragon are extremely dangerous dragons in the books. They feast on the blood of their victim through their neck using their huge teeth.
From their name, a Giant Bee-Eater obviously feasts on bees. These dragons are only in the books, but thought to be mentioned in the film. A Giant Bee-Eater looks much like a Gronkle.
These serpent-like dragons usually inhabit dark caves. Hence their name, Glow-worms are adapted with bioluminescence.
A Gorgenghast is an ancient Sea dragon that are fairly large in size.
Grimler Dragons are extremely dangerous dragons that are only described in the books. Grimler Dragons are twice as large as Deadly Nadders from the film.
Gronkles are terrifying dragons that appear in the How to Train Your Dragon film and the books. They have a thick protected hide, dangerous fire, and are very strong. Gronkles are used in dragon training
"When wetting the Gronkle, make sure to douse the correct end." - Gobber the Belch, training clip
Red-Hot Itchyworms are bright red dragons with a stings worse than hornets. They can cause anyone to itch for hours and are used to guard the Meathead Public Library.
- Dragon species such as the Terrible Terror and Night Fury were created during the first film.
- The Grapple Grounder appears to be exclusive to the How to Train Your Dragon (game)