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How to Train Your Dragon Wiki

A Zippleback? Exotic. Two heads, twice the status. [src]
  Hiccup introducing the Hideous Zippleback  

The Hideous Zippleback is a large Mystery Class (formerly Fear Class) dragon that first appeared in How to Train Your Dragon.

Official Description

Of all the dragons that inhabit our world, one of the most unusual and dangerous is the Hideous Zippleback. The Zippleback is one of the largest dragons you may ever encounter. It's unmistakable with its twin heads. The heads are distinct, with separate thoughts and different personalities. Like most dragons, Zipplebacks can fly, but their wings are small and they spend most of their time on the ground. Zipplebacks are solitary, preferring to hunt alone. They come out after sundown, prowling dark forests for victims. The attack of a Zippleback is like no other. Instead of breathing fire, a Zippleback makes explosions. One head BREATHES gas, and the other head lights it.
This two-headed threat is the longest dragon and has the smallest wings & stubbiest legs. But the way it produces fire makes up for any physical drawbacks. While one head shoots out a flammable gas, the other ignites it with a spark—allowing for attacks from long distances. “It is based more on a Siamese cat combined with a devious snakelike quality.
  Dean DeBlois in an interview with USA Today.[1]  
Gas + Spark = BOOM! This tricky and evasive 2-headed Mystery Class Dragon is double trouble . . . when it isn’t bickering with itself.
The Hideous Zippleback's gas-and-spark combo makes this Dragon a powerful force in battle.
  Dragons: Rise of Berk  
The Hideous Zippleback is classified as a member of the Mystery Class in the Journal of Dragons. These dragons possess a unique method of attack: one head produces a thick green gas, while the other one produces sparks to light it on fire. Any Viking facing off against a Hideous Zippleback should also make sure to not breathe in the gas: It can easily disorient you! This species of dragons can also use the gas produced by one head to obscure itself from view. This makes it easier for the Hideous Zippleback to sneak up on its opponents.
  School of Dragons Website[2]  
With two heads, the Zippleback is twice the trouble of other dragons. One head releases a flammable gas while the other head lights it on fire.
  DreamWorks Dragons: Wild Skies  


The Zippleback's head, neck, and tail movements were inspired by cobras, as they were 'fluid' and 'mesmerizing', says Simon Otto. Their posture and walking structure, however, resembles that of a Komodo dragon or a horned lizard[3].

Original concept art, such as Two Headed by Nico Marlet, depicted the Zippleback with three heads, and a flatter, more collapsible skull. Special attention was paid to the coloring palette, in which the combinations of yellow and red, purple and orange, and teal and orange, were tested.

The modeling and rigging teams had more than twice the fun working on the build of this dragon: imagine what they thought when they were told this design "would have two heads and two long necks that should be able to zip together," recalls Head of Rigging Jeff Light.
  The Art of How to Train Your Dragon  

The Zippleback is described to have 4,769 keyable animation controls, whereas humans only had 1,100.

Physical Appearance


Hideous Zippleback Egg.png

In promotional material for the first film, these eggs are described as containing buoyant natural gases that are often mistaken for air bubbles. These bubbles give the surface of the egg a bumpy look full of craters. The eggs in School of Dragons look similar to those in the promotional material too. In Dragons: Rise of Berk, the eggs don't have any bubbles or mark of their presence whatsoever. Instead, the eggs have a pattern of scales similar to the markings on the neck and back of a Zippleback. They come in a variety of colors.

Hatchling to Adult

The Hideous Zippleback is often described as one of the most unusual dragons in the world. This dragon has two long, serpentine necks with rounded spikes from head to tail. These spikes can 'zip' together, in order to create the illusion of one neck. At the end of the necks, are two short heads. The Zippleback has a large horn on each nose, and two thinner horns on top of each head. Like most dragons, they have yellow reptilian eyes. The teeth in their lower jaw seem to be longer than the ones in the upper jaw, sticking out. They also have two tails, which can also 'zip' together. The end of each tail possesses a fin-like structure shaped like an arrowhead. The official website stated that thanks to their relatively short legs and wings, Zipplebacks are slow walkers and fliers. Despite this, Barf and Belch have been seen flying quite fast. They have short, but strong legs with four sharp claws. The Zippleback is probably one of the longest of the medium-sized dragons, if not the biggest.

According to the Dragons: Rise of Berk mobile game, Zipplebacks have only one heart and thus, it is highly likely that they have only one set of internal organs, except for the heads, necks, and tails.

In the How to Train Your Dragon Live Spectacular, a dragon puppet appears that is simply referred to as 'Nesting Dragon'. It is probably patterned after the Hideous Zippleback, Barf and Belch in particular. It appears to be a sinuous dragon as only coils of it are seen wrapped around a mound of dragon eggs. It has at least one head (but probably more), which has a nasal crest similar to other Zippleback representatives. It also has the characteristic blunt-ended spines along the dorsum, as well as red leopard-like spots along the body over a green-colored base.

Titan Wing

Titan Hideous Zippleback.png

In Dragons: Rise of Berk, like other Titan Wing representations, the Titan Wing Hideous Zippleback is the same in appearance as a Broad Wing Zippleback, just immensely larger. An example is Sparks and Spew, who was seen in the short image story released by DreamWorks Animation called To Tame a Titan!. Titan Wing Forms, however, appear differently in the games.

According to Dragons: Rise of Berk, Titan Wing Hideous Zipplebacks are rather colorful and have many different patterns on their bodies. Its body is grayish green and their wings have three main colors:

  • Blue with white spots
  • Purple
  • Dark Green

There are a large number of spikes added and their tail tips increased in size and are more of a diamond shape.

In the series, a Titan Wing Zippleback looks different than the one depicted in the games. It is almost entirely blue-green and it is less spiky in appearance.


Gas and Spark

The Hideous Zippleback's gas-and-spark combo makes this Dragon a powerful force in battle.
  Dragons: Rise of Berk  
The Titan Wing HZ finds the intruders.gif

The head on the right side breathes a green, flammable gas, while the left head produces an electrical spark from its mouth to ignite the gas, creating lethal explosions, small fire bolts, or large fire 'walls' to contain their enemies. By itself, the gas can make a human disoriented and confused, except for the Thorston Twins, possibly because they have gotten used to it. Zippleback gas can also be used to determine the location of anything camouflaged, because it will go around the solid object. This will give the appearance of an 'empty space'. As shown in the first film, a Zippleback can still emit gas but it’s not flammable as Belch was unable to make an explosion despite having the gas near his head.

Stealth and Hunting

Hideous Zipplebacks can use their gas to hide in, which makes them very stealthy. They use it to unexpectedly strike their victims. The gas acts a smokescreen, obscuring their movements.

These dragons are solitary hunters that prefer to hunt as an ambush. Since these dragons have great stealth, they will use their gas to trap their prey in and sneak attack. They are even able to hunt well in forest bushes for ambush hunt.

Flaming Ouroboros Formation

This special ability of the Hideous Zipplebacks consists of releasing a large amount of gas and then setting themselves on fire. They bite their own tails and become a flaming wheel or ouroboros, which they can use to knock out enemies. It is likely they have to be taught how to use this ability, however.


In the first movie, Fishlegs stated the Zippleback's venom is injected for pre-digestion, which may mean that they have a weak digestive system. However, the stats in the Dragonpedia say that the Zippleback has no venom at all.

Zippleback iS agile and flexible dragon,.gif

Speed and Agility

Barf and Belch were also able to temporarily outrun two rolling Quakens.gif

Despite the official website claiming Zipplebacks are poor fliers and walkers, Hideous Zipplebacks have shown to be quite agile and fast. This was demonstrated in the battle with the Red Death and later also multiple times in the series. Therefore, it is safe to assume that the Zippleback is actually a quite agile and flexible dragon, although nowhere being near the fastest. As shown by Barf and Belch, Hideous Zipplebacks are one of the few dragons that can fly upside down. Barf and Belch were also able to temporarily outrun two rolling Quakens. Barf and Belch are also able to catch up with the Skrill, although the Skrill had been slowed down slightly by Stormfly and Toothless.

THE ENDURAN OF bARF and Belch.gif

Endurance and Stamina

Zipplebacks are able to endure the attack of a Typhoomerang and still able to continue the battle, as they have a large amount of stamina on their side to continue long flights to catch up with other dragons. As shown repeatedly from Barf and Belch, Zipplebacks can recover easily from an giant attack, like a electric-plasma explosion, and remain unscratched. Also when Barf was stung by an immature Speed Stinger, Belch was unaffected and was able to still control the body while dragging around a paralyzed Barf who constantly emitted flammable gas. Barf and Belch was able to recover fast after being hit with a dragon root arrow and crashing into the ocean.


Hideous Zipplebacks have shown to be great climbers.gif

Hideous Zipplebacks have shown to be great climbers as Barf and Belch have shown in the episode, "We Are Family, Part 1" as they are able to climb steep terrain very well.

They will use their gas to trap their prey in.gif


Hideous Zipplebacks have great senses. Both Barf and Belch were able to smell that Hiccup had an eel in him, in the first film. As stated in “Twinsanity”, they can see through fog. Their sense of smell is increased when they are in their Titan Wing stage, but it unknown how acute their smell is in their Broad Wing stage. Due to their two heads, Zipplebacks don't often rely on their senses as their two heads make them incredible hard to sneak up on.

Strength and Combat


Despite their long, thin appearance, the musculature in a Zippleback's necks is enormously powerful, which combined with the thickness of their skulls make their heads formidable weapons. In "A Grim Retreat", Barf and Belch used their heads as hammers, pounding sheets of Gronckle Iron flat after they had been smelted by Meatlug and heated by Hookfang. Likewise, in "Defenders of the Wing, Part 2", Barf and Belch were able to smash a stone pillar supporting the statue of the Defenders' Great Protector, dropping it into the path of oncoming lava

Bard and Belch opens the cauldron.gif

A Zippleback can entwine its necks and produce even greater force. In "Dire Straits", when Hiccup was trapped inside his Diving Bell, Fishlegs initially believed it was dragon-proof, but Tuffnut inserted a pry bar and, at his command, Barf and Belch "zipped" their necks together and were able to apply enough torque to open a panel in the side. A Zippleback likewise proved capable of carrying the combined weight of a Gronckle, Fishlegs, Tuffnut, and Ruffnut without too much difficulty. However, a single neck of a Zippleback, as shown by Barf, was incapable of carrying a very heavy rider. Barf and Belch are also able to carry a large dragon like the Titan Wing Dramillion with little effort and without the aid of other dragons, however this is an inconsistency and should not have happened as portrayed.

They were able to avoid being dragged off the roof by Toothless.gif

In combat, Barf and Belch were strong enough to easily take out multiple Outcast, Breserkers, and Dragon Hunters with just their heads. They are also strong enough to hold their ground against Toothless, as they were briefly able to avoid being dragged off the roof by Toothless (Toothless later got them off the roof by the time Hiccup came) and stood their ground on an equal level as shown in the episodes "Twinsanity" and "A Tale of Two Dragons".

Barf and Belch's distress signal.gif


While growing, hatchlings are stated in Dragonpedia to have high intelligence and problem-solving abilities, such as having one head watch for danger while the other watches for food, or managing to solve complex problems such as one head scaring the prey into the mouth of the other head.

Barf and Belch saves the village.gif

Zipplesbacks have proven to be very intelligent at times. In the first film a Zippleback was the first out of all the dragons to find where the Hooligan Tribe hid their sheep. And Barf and Belch knew to use their distress call when Hiccup was in trouble in "The Zippleback Experience". They also knew to use the Eruptodon statue on Caldera Cay to stop the flow of the lava threatening to destroy the village, as shown in "Defenders of the Wing, Part 2".

Transmitting Information

They have a special ability to simultaneously transmit information to both of their brains. For example, if one head wears a blindfold and food is stuck in front of the other head, both heads will start salivating at the same time, even though only one can actually see the food. With this special ability, it makes it nearly impossible to sneak up on a Zippleback. The two heads, however, still possess their individual thoughts and different personalities.

Titan Wing Abilities

As shown by the Titan Wing Zippleback and Sparks and Spew, Titan Wing Hideous Zippleback could find the twins with their enhanced senses to sniff them out and smart enough to use their flammable gas to determine their location. They are also have better stamina and endurance, able to take multiple blast from a Deadly Nadder, a Gronckle, and even a Night Fury plasma blast to the head. They are extremely stronger than their Broad Wing counterparts. As other Titan Wings, they are seen as the leaders of their species, as the Titan Wing Zippleback was able to command his pack of Broad Wing Zipplebacks.

Hideous Zippleback can get confused with too much racket and loud noises.gif


Hideous Zipplebacks are susceptible to common dragon weaknesses such as Dragon Root, Eels, Blue Oleander, Dragonvine, and Grimora parasites. Similar to Gronckles and Monstrous Nightmares, Hideous Zipplebacks can get confused with too much racket and loud noises[4] and loud screeches from other dragons like the Screaming Death or the Sentinels, but this could be said for most dragons.

Conflict between Personalities

They even slam into objects if both heads are not paying attention when chasing prey.gif

The dual heads can be a vulnerability, as Drago Bludvist's forces were able to incapacitate a Zippleback by shooting darts into the neck of one head, knocking both heads out. The two heads have different personalities, and if they don't work together, it can be hard for them to do anything. They even slam into objects if both heads are not paying attention when chasing prey, as shown when a wild Zippleback chased Tuffnut into a tree. However, when Barf was stung by an immature Speed Stinger, Belch was unaffected and proceeded to drag around a paralyzed Barf who constantly emitted flammable gas. This is especially a problem when they reach their Titan Wing stage, as shown by Sparks and Spew.

Lack of Speed

Perhaps due to their larger size and relatively short but broad wings, Zipplebacks are slower in flight than many other species. Although this doesn't mean they are slower then some dragons like Gronckles.

Dousing Spark Ability

Dousing the sparking head with water can short out the fire.gif

According to the first film How to Train Your Dragon, dousing the sparking head with water can short out the fire starting ability, leaving the Zippleback unable to light up the flammable gas from the other head.

Behavior and Personality


The dragon has two personalities and two minds, one in each head, and often these different ideas, thoughts, and personalities causes the Hideous Zippleback's heads to argue with each other over what to do. This dragon reminds some Vikings of bickering siblings when they aren't running away from it. Occasionally the dragon forgets that it's a two-headed dragon, and one head tries to go one way, and the other head tries to go the other way, this can be problematic. As seen in Dragons: Rise of Berk, one head of some Hideous Zippleback individuals, such as Sparkle & Sparks, can even end up falling in love with the other head. Even baby Zipplebacks fight over which direction to go or what to do.

Despite squabbling between heads, Hideous Zipplebacks tend to be very social amongst their own kind and even other species. Many tend to form packs, such as the Valley Zippleback.

BARF AND BELCH BEING gratefull.gif

It has been stated by Gobber that once this dragon is saved by a Viking, they must pay their longtime debt. They are willing to do everything to show how grateful they are of their savior by giving them fish or affection. This could be another way of training a Zippleback or any other dragon species. As Barf and Belch have proven, they will even leave their old riders behind to stay with another for his entire life until they return the favor.

The heads grin at each other as the Twins continue to fight.gif

It's shown in a training addition to How to Train Your Dragon that Hideous Zipplebacks (and other dragons) have a sense of humor; when a Hideous Zippleback attacks Ruff and Tuff while the two twins fight, the heads grin at each other as the Twins continue to fight dangling from the Zippleback's mouths[4].

As seen in the "Battle for the Edge" expansion in School of Dragons, Hideous Zipplebacks typically prefer to eat fish. Fishlegs Ingerman theorized that this diet resulted in the dragon's two heads, as this would allow the Hideous Zippleback to capture its prey more easily than it would with just a single head.


Barf and Belch defends Hiccup against some Berserker soldiers.gif

To train a Zippleback, you must feed both heads at once, then play with the dragon to keep it occupied. Another way to train one is to save a Zippleback's life. If this is done, they will be completely loyal to the person no matter what until they can repay the favor.

In the game, How to Train Your Dragon, feeding ham to a Zippleback will train it. No further instructions are given. According to the game, ham is a Hideous Zippleback's favorite food.

Zipplebacks are easily trained by feeding both heads fish.gif

Dragons: Titan Uprising indicates that Zipplebacks are easily trained by feeding both heads fish. This is more true for certain groups of Zipplebacks, such as the Valley Zippleback.

Despite being relatively easy to train, Zipplebacks tend to learn mischevious lessons quicker than mundane ones, especially those that involve destruction, as indicated by Dragons: Titan Uprising.

Comparative Statistics


How to Train Your Dragon

Main article: Barf and Belch

Ruffnut and Tuffnut on the Hideous Zippleback, when fighting the Red Death

The first Zippleback is seen during Hiccup's opening narration, where he describes the Zippleback and one blasts a hut. During the gang's third test, they were pitted against a Hideous Zippleback. The dragon starts the drill with a bang, releasing gas into the arena the moment the doors are loose. Amidst the fog, it slowly picks out the students. When they face the last pair, Hiccup and Fishlegs, Fishlegs pours a bucket of water on the head that gases and the Zippleback attacks Fishlegs, who makes a prompt escape. The other head emerges from the fog, and Hiccup prepares to splash the head that sparks with water, only to miss hopelessly. Hiccup learns from Toothless that most dragons hate eels enough to actually fear them and uses this against a Zippleback to scare it back into its pen during dragon training. When Toothless brought Hiccup and Astrid to Dragon Island, a number of Zipplebacks were seen within the mountain, most notably one that was consumed by the Red Death as she went after the escaping dragons. At the end of the movie, a Hideous Zippleback (eventually named Barf and Belch) is flown by Ruffnut and Tuffnut. Each head seems to agree with one twin and they have appeared in almost every other episode since then.

Gift of the Night Fury

Barf and Belch was one of the dragons that headed to the Rookery from Berk. A baby Zippleback was seen playing with two children when the dragons returned to Berk.

Book of Dragons

The Zippleback was introduced into further detail during this short. Bork chased his trusted sheep, Willie, into a cave that was unexpectedly a Zippleback's lair. The dragon caught Bork's attention and Bork pulled out a sword trying battling both heads. The Zippleback caused an explosion and defeated Bork. You may be able to befriend a Hideous Zippleback if you feed and play with both heads at once, keeping them occupied.

Dragons: Race to the Edge

Season 2

Main article: Whip and Lash

Bucket and Mulch received a blue and green Zippleback, named Whip and Lash, during their recruitment in "Team Astrid". They later then helped defend the Edge against Dagur's attack, and received the compliment from the Twins, that they were like a better-looking mirror.

Season 6

Main article: Titan Wing Zippleback

In the episode, "A Gruff Separation", Ruffnut and Tuffnut take the Thorston Induction Trials. In the final task, the Twins complete in getting a chest from a Titan Wing Zippleback's nest.

How to Train Your Dragon 2

A blue Zippleback was first seen getting its teeth cleaned at Gobber's. Later on, some were seen in Valka's Sanctuary. During the Battle of the Bewilderbeasts, captive Zipplebacks used the Flaming Wheel technique to knock out the traps and trappers.

How to Train Your Dragon: Homecoming

The Zippleback is pictured in a Dragon Manual formerly belonging to Stoick that Zephyr Haddock finds packed away in the Haddock House on New Berk.

Dragons: Rescue Riders: Hunt for the Golden Dragon

A picture of a Hideous Zippleback is seen on the wall leading to the Golden Dragon. Leyla identifies it as a Mystery Class dragon.


How to Train Your Dragon

In this game, Zipplebacks can be trained by feeding it ham. There are both trained and wild Zippleback to fight throughout the game. Zipplebacks are also customizable — their head horns, wings, feet, spine protrusions, tail ends, and color can be changed.

How to Train Your Dragon Mobile Game

Hideous Zipplebacks appear in this game fleeing in large numbers from something (discovered to be the Red Death). The player - playing as Hiccup flying on Toothless - must dodge these dragons to avoid health damage.

DreamWorks Dragons: Wild Skies

Described as 'Double Trouble, Two Heads are Better than One', this dragon resides in Black Heart Bay. In this game, only one rider is required to properly control this dragon. Training this dragon unlocks the 'Double Trouble' achievement.

Dragons Hero Portal

Barf and Belch appear in this game as part of one of the rider/dragon pairs the player can choose to play as.

Dragons: Rise of Berk

The Zippleback, as well as Barf and Belch, their mate, and offspring, Exiled Hideous Zippleback and Whip and Lash became available in Rise of Berk. Their Titan form and battle form were also made available in the game.

School of Dragons

This dragon was also made playable, along with its Titan form which was adapted from the Rise of Berk version.

Dragons: Titan Uprising

Several Hideous Zippleback individuals, like The Squabbling Sparks and Spew, Tricky Two-Heads, Zesty Zippleback, Valley Zippleback, and Muck and Tumble, and hybrids such as the Ghastly Zapplejack and Zipplewraith appear in this game.

Live Shows

How to Train Your Dragon Live Spectacular


Zipplebacks are mentioned a few times in dialogue in this theatrical retelling of the first movie. There is a small part of this production that has a serpentine-appearing dragon coiled around a mound of eggs that has very similar features to Barf and Belch that may be a live-action representation of a Zippleback. This creation is only referred to as 'Nesting Dragon'.


  • Asterisk-Transparent.png The official measurements of the Hideous Zippleback, as released by DreamWorks Animation are 66 feet (20.11 meters) in length, and 38 feet (11.58 meters) in wingspan.
  • Throughout the DreamWorks Dragons franchise, the Hideous Zippleback has changed physical appearances.
    • In the first film, a lot of Zipplebacks with the exception of Barf and Belch possessed longer spikes at the back of their flatter jaws and smaller eyes.
    • There are differences between the denture, as well as the nasal horn shape of the two heads, which has also become less noticeable.
  • In School of Dragons, Tuffnut said that only a Zippleback can light its gas on fire and that a Nadder can't do that. But in the second film it was shown exactly the opposite — after Barf and Belch covered the traps with gas, Stormfly set it on fire.
  • While in Barf and Belch, the left head spews gas while the right head sparks, different Zipplebacks can have the opposite, as Gobber mentioned it was "tricky" to tell which head was the spark-igniting one.
  • The Hideous Zippleback resembles Zmey Gorynych, the Slavic Dragon.
  • The Zippleback's name is possibly derived from Zippo, a brand of lighter, which is fitting as one of the dragon's heads serves to light the gas produced by the other head. It could also be from "zipper", as the dragon can link and unlink the spines on its neck and tail together.
  • When Barf and Belch approached Hiccup in the first film, they fanned out their wings, flapping them slightly and started aggressively hissing at him, which mimics the behavior of the Dilophosaurus in Jurassic Park when it fans out its frill and growls to spit venom. This behavior is presumably done to make the Zippleback seem more menacing and larger than they appear. This display is never seen again.
    • In the early concept arts, the Hideous Zippleback had a frill similar to the Dilophosaurus.
  • The film Wrath of the Titans may have referenced the Zippleback: one of the monsters Perseus fights is a two-headed Chimera, where one of its heads spits out flammable saliva and the other one ignites it with hot embers, and working together can produce bursts of flame, just like the Zippleback.
  • In DreamWorks Dragons: The Series, Barf and Belch can't fly with only one rider, or even no riders. However, in Dragons: Race to the Edge, How to Train Your Dragon: The Hidden World, DreamWorks Dragons: Wild Skies, the How to Train Your Dragon video game, and School of Dragons, Hideous Zipplebacks only need one rider.
  • According to the "Battle for the Edge" expansion pack in School of Dragons, the Hideous Zippleback shared a common ancestor with the Snaptrapper at some point in the past. This ancestor then diverged into the two different species after their physiology adapted to match their preferred diet and habitat.
  • In The Art of How to Train Your Dragon, the Hideous Zippleback is described as having the best vision among the dragon species.
  • The Dragonpedia states that Seashockers are cousins of Hideous Zipplebacks. It is possible that Seashockers share a common two-headed ancestor with Hideous Zipplebacks, since extreme adaptations likely evolved once.
  • It is possible like two-headed conjoined twins, Hideous Zipplebacks have two hearts and two pairs of lungs. This is likely because the Zippleback's upper torso appears to be divided.
  • Zipplebacks made an appearance in the trailer for Minecraft's How to Train Your Dragon DLC, and have been put into the DLC as a blocky, tamable, ridable dragon.


Hideous Zippleback uses Creative Commons Licensed content from the Rise of Berk Wiki page Hideous Zippleback. The list of authors can be found on the page revision history (view authors). ROBWiki Logo.png
Hideous Zippleback uses Creative Commons Licensed content from the Dreamworks School of Dragons Wiki page Hideous Zippleback. The list of authors can be found on the page revision history (view authors). SODWikiLogo.png

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