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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. A lot of dragons can be tamed and have human companions.

They are the main characters in the How to Train Your Dragon books.

Description

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.

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"Viking Biologists had wondered for years where the fire that dragons breathed came from. Some said the lungs, others the stomach. Hiccup was the first to discover the fire-holes, which are too small to see with the naked eye in a normal-sized dragon."
―Book 1

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 Toothless was just a baby. Their eyes also shine in the dark.

Dragons have a particular odor as well as described in Book 1 - "the stench of dragon - a salty stink of seaweed and old mackerel heads".

Dragons start out as an egg, and after hatching they grow. Some hatch, grow to enormous proportions in their prime, then start shrinking again to juvenile size until death. This growth pattern is seen in the Seadragonus Giganticus Maximus. Others are able to remain in their eggs for hundreds of years until the right conditions are met in the environment to hatch.

Diet

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 fire breathing. A dragon that can't breathe fire gets very sick and eventually explodes.

Abilities

Sleep Coma

Dragons are able to go into a suspended state for hundreds of years. The Dragons may appear dead. There may be no detectable breath or pulse, and feel cold to the touch.

"The Dragon had crawled down into the depths of the ocean and gone into Sleep Coma. Dragons can stay in this suspended state for eternity, half-dead, half-alive, buried under fathom after fathom of ice-cold seawater. Not a muscle of this particular Dragon had moved for six or seven centuries."
―About the Green Death in How to Train Your Dragon

Hypnotism

All dragons can mesmerize humans and prey from their gaze alone (the species that have eyes). However, they must be looked at directly in the eyes, and keeping your gaze diverted from them can reduce the hypnotic potential.

"Hiccup had to blink a lot because the gaze of a dragon is hypnotic and give the unnerving feeling that it is sucking your soul away."
―Book 1

Intelligence

Dragons' intelligence greatly varies by 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.

Immunity to Fire

Most dragons "are only fairly fireproof", but to a much greater extent than humans are. Vikings may wear dragon skin clothing as a protection against flames. Some species are completely fireproof and can live in lava.

Weaknesses

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. Many 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 extinguish all dragons from the face of the earth, as inside the jewel, two dragons are present, one of which is suffering from a extremely deadly disease.

In Book 1, Hiccup relates that "Dragons have a tendency to asthma" due to their fire-breathing and smoke generation. He uses this weakness to his advantage when he feather bombs the colossal Green Death and Purple Death.

Behavior

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Dragons in the books are described as being very sneaky selfish creatures who are never thankful for anything and will only obey under 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. This selfish survival code is known as Dragon Law amongst the dragons.

"The thing about us d-d-dragons ... is we're s-s-survivors. We're no like s-s-sappy cats or d-d-dumb dogs, falling in l-l-love with their Masters and yucky things like that. Only reason we ever do what a m-m-man wants is because he's b-b-bigger than us and gives us food. ... N-n-never trust a dragon."
Toothless in Book 1

Toothless further iterates this point while he is harboring concerns about Hiccup's fate with the Green Death.

"Dragons are S-S-SELFISH ... Dragons are heartless and have no m-m-mercy. That's what m-m-makes us s-s-survivors."
―Toothless arguing with himself in Book 1

Toothless finally decides to help his Master, despite going against Dragon Law. This shows that proper treatment of dragons - treating them as friends - can encourage loyal, friendly, and selfless behavior in dragons.

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 in fire since their skin is fairly fireproof, and some species are even completely immune to it.

As many animals do in the face of a threat, dragons may puff themselves up to appear larger.

"He [Toothless] inflated his neck to make himself look bigger, which is something dragons do when they are scared or angry."
―Book 1

Fate

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