Editing Draconic Taxonomy

Casual observers may initially perceive dragons as reptilian in nature.  While it is true that both have scales and hatch from eggs, dragons differ from reptiles in at least one important respect: they are warm-blooded.  In the field, the crews of harnessed dragons may seek shelter against their dragon's sides for the warmth given off.  Sir [[Edward Howe]] notes that "heavier dragons greatly prefer warm environs, where their air sacs can more easily compensate for their great weight" (Howe, 1796), and certainly all dragons enjoy basking in warm locations.  However, warmth appears to be a pleasure rather than an absolute necessity for them.  Young heavy-weight dragons - including a [[Regal Copper]], one of the largest breeds - have been observed to frolic in the icy waters of [[Loch Laggan covert|Loch Laggan]] with great enjoyment.  The basking behaviour of dragons may thus be compared more closely to that of some mammals (notably, cats) rather than the behaviour of reptiles such as iguanas. 

The particular combination of scales and eggs with warm blood is the hallmark of the order Draconia, first described by [http://en.wikipedia.org/wiki/Carolus_Linnaeus Carl Linnaeus] (1707-1778) in his ''Systema Naturae''.  Later researchers in the field of evolutionary theory established by [http://en.wikipedia.org/wiki/Charles_Darwin Charles Darwin] (1809-1882) have established that both dragons and birds are descended from dinosaurs, specifically from the primarily carnivorous [http://en.wikipedia.org/wiki/Theropoda theropods] rather than herbivorous [http://en.wikipedia.org/wiki/Sauropodomorpha sauropodomorphans] or [http://en.wikipedia.org/wiki/Ornithischia ornithischians] (''cf.'' [http://en.wikipedia.org/wiki/Othniel_Charles_Marsh Marsh], 1881; [http://en.wikipedia.org/wiki/Harry_Seeley Seeley], 1888).

There is a paucity of data concerning members of the order Draconia other than dragons themselves.  The one notable exception are the [[Sea-serpents|sea-serpents]] or, more properly, sea-dragons (''kiao'' in Chinese), which are known to live in the Atlantic, Pacific and Indian Oceans, as well as the China Sea.


==The evolution of draconic flight==

Sir [[Edward Howe]] notes that "the most common French breeds, the [[Pecheur-Couronne]] and the [[Pecheur-Raye]], are more closely related to the [[Grey Widowmaker|Widowmaker]] breed than to the [[Yellow Reaper|Reaper]]s, if we may judge by wing confirmation and the structure of the breast-bone, which in both breeds is keeled and fused with the clavicle.  This anatomical peculiarity renders them both more useful for breeding down into light-combat and courier breeds, rather than into heavy-combat breeds" (Howe, 1796).  

Note that the keeled breast-bone and fused clavicle typical of Widowmakers and Pecheurs are known to exist among other vertebrates only in [http://en.wikipedia.org/wiki/Bird_anatomy#Skeletal_system birds].  It would appear from Sir Edward's description that Reapers and larger breeds have breast-bones and clavicles more similar to those of bats.  However, in both birds and bats, the wings exist as modifications of the forelegs.  Dragons are unique in having two wings ''plus'' four legs, suggesting that they may have evolved from land animals with six limbs.  

This suggestion may at first appear to make it impossible for dragons to share, along with mammals, bird and reptiles, an evolutionary descent from the earliest Devonian members of the Superclass Tetrapoda of the Subphylum Vertebrata.  However, if one chooses to postulate an entirely separate Superclass - "Hexapoda" - at least two problems arise.  One is the lack of evidence, either living or fossil, for other hexapodal lifeforms which have any ''other'' notable characteristics in common with dragons.  There is no obvious resemblance, for example, between dragons and insects (juvenile jokes about dragonflies aside).  The other problem is that almost every characteristic demonstrated by dragons ''aside'' from the number of limbs (i.e., legs plus wings) is shared by some branch of tetrapodal fauna, either reptilian, avian or mammalian.

The sharp blade of Occam's razor leaves little choice but to postulate that dragons, like snakes, are members of Tetrapoda, even though one group has six limbs and the other none.  It appears that at some point in history, the first protodraconid species developed a third pair of limbs forward of the forelegs.  It may be that these "ultraforelegs" were never either used or useful for terrestrial locomotion but instead developed directly into wings.

The body structure of dragons' close relatives, the [[Sea-serpents|sea-serpents]], may be of use in the eventual unravelling of this mystery.  One sea-serpent observed in the Indian Ocean in 1806, the largest on record at 250 feet long, was noted to have had forelegs which were spindly in proportion to the rest of its body, with webbing stretched between relatively long, taloned fingers.  It may be that these were in fact not true forelegs at all, but rather were expressions of the same "ultraforelegs" that later developed into wings in draconic species.


==Species or breeds?==

It remains unclear whether all sapient dragons are members of one species (''Draco sapiens'') or rather represent different species of the same genus.  Sir Edward's phrasing might imply that it is simply more practical to breed Pecheurs down, but it might also imply that in fact Pecheurs (and other breeds with keeled, fused breast-bones, such as Widowmakers) are infertile with Reapers and heavier breeds.  The defining trait of a species is that its members can not produce fertile offspring  - if they produce any offspring at all - when interbred with members of other species.  It may be that the many European breeds of dragons represent variants or perhaps subspecies of two distinct species, typified among native British breeds by Widowmakers on one hand and Reapers on the other.

It is also not clear whether European breeds are of the same species as breeds of dragons from China, Central Asia, Africa or the Americas.  A [[Dakota]] dragon from Western [[Dragons in Canada|Canada]] was resident for at least a while in two British breeding grounds, Newfoundland and [[Pen Y Fan Breeding Grounds|Pen Y Fan]], but there is no report of resulting eggs.  The same is true for a young male [[Celestial]] resident for a period of three months at Pen Y Fan, who had also bred previously with a [[Yellow Reaper]].  Feral dragons from the Pamir Mountains in Central Asia brought to Britain in 1806 and 1807 appear to have preferred to breed with each other.

Celestials represent a particularly interesting case of the complexities involved in establishing a draconic taxonomy.  According to reports from the imperial court of the [[Jiaqing Emperor]], Celestials cannot produce fertile offspring from mating among themselves, but they are known to be able to breed with [[Imperial]]s.  In fact, periodically a Celestial may be born from the mating of two Imperials, such as the ancient patriarch respectfully known as "[[Grandfather]]".  The Celestial phenotype may arise from the expression of recessive traits carried by Imperials. 

The endogamous sterility of Celestials may suggest the further presence of a lethal recessive gene, such as with the tailless cats common on the Isle of Man; however, this may have been induced by an extreme population bottleneck and the intensive inbreeding that followed, rather than a necessary consequence of the Celestial phenotype itself.

An alternate hypothesis, that Celestials represent a spontaneous mutation among Imperials, does not explain why Celestial traits are consistent among different lineages.  One would expect spontaneous mutations to have random effects.

Imperials are known to be interfertile with [[Shen-Lung|Shen-lung]].  It is the practice in China for the wisest of the Shen-lung to be rewarded with an Imperial mating, a practice that would hardly have continued if such matings never resulted in offspring.  Shen-lung in turn are known to have given rise to many other Chinese breeds.

If future data reveal that Celestials, Imperials or Shen-lung are not interfertile with dragons from other nations, thereby ending the possibility of one general ''Draco sapiens'' species, then one might instead propose as a species ''Draco sinensis'', including as subspecies and variants ''Draco sinensis spiritualis'', ''Draco sinensis imperialis'' and ''Draco sinensis imperialis var. caelestis''.  However, since it is not known whether or not ''all'' Chinese breeds are interfertile with Shen-lung, it is not possible to determine at this time whether or not all Chinese breeds might be considered members of this hypothetical species.

References:

''Observations on the Order Draconia in Europe, with Notes on the Oriental Breeds,'' Sir Edward Howe, F.R.S., chapter V.  Published by John Murray, Albemarle Street, London, 1796.

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