The Dragons of Pern are a fictional race created by Anne McCaffrey as an integral part of the science fiction world depicted in her Dragonriders of Pern novels.
In creating the Pern setting, McCaffrey set out to subvert the clichés associated with dragons in European folklore and in modern fantasy fiction. Pernese dragons are similar to traditional Western dragons in the fact that they can breathe fire and resemble great lizards or dinosaurs with wings, but the resemblance ends there. Unlike most dragons in previous Western literature, Pernese dragons are entirely friendly to humanity. Furthermore, they are not magical at all. Instead, they are a heavily genetically modified species based on one of Pern's native life-forms, the fire-lizard.
Kitti Ping designed the dragons to gradually increase in size with each generation. The dragons of the first Hatchings were not much bigger than horses. Nine Passes (2500 years) later, when the most of the novels have so far been set, they had reached their programmed size. The largest Pernese dragon on record, Ramoth, hatched twenty-five centuries later and according to the novel All the Weyrs of Pern was roughly three times the size of the largest first-generation dragons. Her great size is often attributed to mutation and the genetic isolation of Benden Weyr for over 400 years (or Turns). Ramoth, at full length, was forty-five feet (Although The Dragonlover's Guide to Pern, written by Jody Lynn Nye with input from Anne McCaffrey listed it incorrectly as forty-five metres). Newly hatched dragons are the size of very large dogs or small ponies, and reach their full size after eighteen months. Because young dragons grow so fast, their riders must regularly apply oil to their hides to prevent the skin from cracking or drying out.
Dragons, like their fire-lizard ancestors, can breathe fire by chewing a phosphine-bearing rock, called "firestone" in the novels, which reacts with an acid in a special "second stomach" organ. This forms a volatile gas that can be exhaled at will and ignites upon contact with air. The flame is used to burn Thread from the sky before it reaches the ground. However, the chewed firestone must be expelled from the body after it is used up, for the dragons cannot digest it.
Dragons and fire-lizards can also teleport. They do this by briefly entering a hyperspace dimension known as between. Both humans and dragons experience between as an extremely cold, sensory-deprived, black void. After spending no more than eight seconds in between, the dragon or fire-lizard can re-emerge anywhere on Pern, along with any passengers or cargo they carried. This ability is explained as having evolved in fire-lizards as a defense against Thread; not only does it allow them to quickly escape from Threadfall, but the intense cold of between kills any Thread that has already burrowed into them. If a dragon attempts to teleport without a clear mental image of the place where they intend to reappear, they may simply fail to emerge from between and thus, be gone forever.
Going between allows dragons to travel through time as well as space, as long as they have a clear picture of what a particular place looked like (or will look like) at the desired time. However, the practice is highly dangerous to both dragon and rider and is severely restricted. Existing in two places at once for extended periods of time, or in close proximity, causes severe weakness and psychological disturbance for humans but not for dragons, the effects of which are discussed in several novels. In addition, while teleporting through space always takes the same amount of time, when a dragon travels through time, the amount of time they spend in between increases depending on how long ago or how far in time the destination is. Thus, traveling to remote times poses severe dangers from hypothermia and oxygen deprivation. In the first Pern novel, Dragonflight, Lessa passes out after having travelled back over 400 turns.
The Dragonlover's Guide to Pern states that dragons defecate while between. This idea originated with a statement by Anne McCaffrey herself, in answer to a fan's question about the subject at a con. However, McCaffrey may have been joking when she first said this. As the idea has never been referenced in any of the Pern novels, (in fact, defecation was probably only mentioned a scant few times in all of the books ever written in the Pern series.) it cannot be considered definitively canonical. If true, it would eventually cause serious ecological problems for the planet, as large amounts of Pern's organic matter would be regularly disappearing into an alternate dimension, although when dragons and riders die, they go between, and organic matter is also lost. It should be noted that The Skies of Pern references the use of dragon dung as a repellent against the large felines inhabiting the southern continent.
Dragons are also capable of telekenesis, though this ability is unknown and used in an unconscious manner (to augment flight) until it is discovered as a conscious ability by the green dragon Zaranth and her rider Tai in the 31st turn of the 9th Pass. It is speculated that the undersized wings were intentionally created in the dragons by Kitti Ping to reduce the surface area of a dragon that is exposed to possible Thread injury, and that the telekenisis was intended to make up for the loss of wingsail. It is said in many books that a dragon can carry whatever it thinks it can carry. This is likely an extension of the telekenesis, mentally "lifting" the extra load. This is the most likely explanation as to the great loads that dragons sometimes carry during emergencies.
Dragons' telepathic communication is usually limited to contact with their rider and with other dragons, however a dragon sometimes communicates well with a person with whom their rider has close emotional ties. They do understand spoken human language and occasionally reply telepathically to people whom they choose to speak.
As a safeguard against the possible damage that could be caused by such powerful creatures, Ping engineered dragons to be profoundly psychologically dependent on their riders. Any dragonet that fails to Impress to a human shortly after hatching will die. If a dragon's rider dies, the dragon immediately suicides by going between without a destination. The only exception is when the rider of a queen dragon dies while the queen is gravid; the dragon waits just long enough to lay her eggs and see them hatch before disappearing between. (Humans who lose their dragons typically commit suicide as well. However, some do survive, although the experience leaves profound psychological trauma.)
Ping also designed the dragons to be fairly calm in temperament. They never fight one another, unless two queens come into estrus at the same time. They are also not dangerous to humans except shortly after hatching, when it is common for confused and frightened dragonets to maul or even kill humans hoping to Impress.
When a dragon hatches, they announce their names to their new riders upon Impression. Pernese dragons' names always end in -th. A watch-wher's name will end in "sk".
The larger a color is, the less common it is. For instance, there are more Blues than Browns, and there are more Browns than Bronzes. Half the dragon population is female, with Green dragons being roughly fifty percent of the population and Golds being one percent or slightly less.
Riding a larger color of dragon confers higher social status in Pern's extremely hierarchical society, color rankings following the dragons own strict instinctual hierarchical organization based on fire-lizard structures. Perhaps as a result of this, it is commonly believed that the larger colors are more intelligent, although recent novels imply that this may not be true.
The Pernese believe that chewing firestone makes female dragons sterile; they therefore refuse to allow queens to use it. Greens, on the other hand, are so common that if they produced offspring it would quickly lead to overpopulation. They always chew firestone, and because of their numbers and agility they are vital to any Thread-fighting force. However, Dragonsdawn suggests that Kitti Ping -possibly motivated by old-fashioned ideas about gender roles- deliberately engineered greens to be infertile and gold dragons to be incapable of producing flame in order to protect the gold dragons, the only reproductively fertile females, from the dangers of Thread fighting.
When a female comes into estrus, interested males compete to catch her in a mating flight. Usually, the female chooses the male who impresses her the most with his skill in the flight, although inexperienced females may be caught before making their choice. The pair actually mate in midair; thus, the higher they get during the flight, the longer their mating can last. The Pernese commonly believe that longer matings result in larger clutches. For this reason, queenriders are strongly encouraged to restrain their dragons from eating heavily just before a flight, instructing them to drink blood instead for a quick burst of energy.
For much of Pern's history, all greenriders are male. During these periods, all green mating flights result in homosexual intercourse between the riders of the dragons involved. This homosexual intercourse is accepted in the Weyr as being separate from the rider's personal preferences unless the rider has shown otherwise. Mating flight sex between two riders, one of whom is not the other's chosen partner (known as a weyrmate) is not considered to be "cheating." It is understood within the Weyr that sex during mating flights is not optional for the rider. Anne McCaffrey stated that "The dragon decides, the rider complies." Dragons do not usually consider the preferences of their riders when considering what female they wish to chase, or for a female dragon, what male dragon might catch her. A primary example of this behavior is between Weyrleader T'gellan, Weyrwoman Talina and greenrider Mirrim. T'gellan and Mirrim are weyrmates, but T'gellan's bronze dragon must mate with Weyrwoman Talina's gold dragon at least yearly in order for T'gellan to maintain his position as Weyrleader. Mirrim, known to be an extremely acerbic and temperamental rider, shows no jealousy or other problem with her weyrmate's regular sexual contact with Talina.
Riders of the losing dragons usually seek sexual relief after the intense flight, if they do not have a chosen partner they may seek the comfort of any willing and available partner of their sexual preference. The weyrfolk tend to happily accommodate these riders, especially if they have been affected by the flight's sexual urgency. This is one of the major reasons for the Weyr's reputation for being sexually very open.
However, these ideas have never been made explicit in the books (although it is clear, at least, that most male green- and blueriders are homosexual). Many members of online Pern fandom find McCaffrey's ideas about sexuality highly questionable for a number of reasons, both scientific and ethical. (Most infamously, she claimed in an interview that science has proven that being the receptive partner in anal sex triggers a hormonal change that will make a previously heterosexual man become homosexual and effeminate. Thus, she argues, even if a male greenrider were originally heterosexual, he would not stay that way.) In later interviews McCaffrey claims that green dragons merely pick up on psychological clues from homosexual boys before they themselves know that they are homosexual. "A green Hatchling is unlikely to be impressed (pun intended) by a heterosexual boy." - Anne McCaffrey 1998 on The Kitchen Table BB.
Pern-based roleplaying games thus sometimes ignore McCaffrey's restrictions on who can Impress to a given color of dragon. MU*s and fanzine-based clubs often ignore everything except the basic rule that only women Impress gold and only men Impress bronze; PBEM games are more likely to accept the restrictions on sexual orientation. Most clubs post their policy on canon strictness. While some accept more liberal thoughts on color/gender/sexual orientation matches, many are very strict on this issue.
For the purposes of roleplaying games, McCaffrey has also officially allowed females (masculine lesbians) to ride browns or blues, though she insists that this could never happen on her (canon) Pern.
Also in fandom, if a rider has strong objections to sex with someone involved in a mating flight or the writer has objections to writing a homosexual encounter or object to their character being involved in a sexual encounter with a person other than their "significant other," they may sequester themselves with a more acceptable partner during the flight. This idea is called "Stand-Ins" and based on a concept McCaffrey introduced in Dragonseye/Red Star Rising, in which a female greenrider objects to the idea of a specific bronzerider winning her green's mating flight. However, this concept is not seen in other books and clearly does not exist in the 9th Pass, as several problems arise regarding green and goldriders who object to the random nature of mating flights and end up raped by the male winner of the flight (most notably in Skies of Pern).