
Frequently mistaken for dragons, wyverns are a completely different species. These differences are quickly distinguishable at a glance, or upon an encounter.
Wyverns, aside from elemental and regional differences, have a distinct overall shape. Their sharp scale forms possess powerful hind legs and a wide wingspan, webbed with a skin material, attached to their dexterous arms. This is the most distinct feature to set them apart from their cousin species, dragons, who possess four legs and wings, covered in heavy scales, coming out of their shoulders separate from their limbs.
Other physical observations of wyverns include: a narrow, sharp snout; large, protruding fangs similar to those of a snake; a pointed tail tip; and claws useful for prying and climbing. Regional variants provide a wide range of coloration; though interestingly, there always seems to be an overall grey hue.
Past the physical differences, wyverns have other observable traits once encountered in close range. This is, as you can imagine, quite the difficult task to accomplish making a majority of the information we have to be gathered from deceased specimens. This provides accurate enough information, though it is far less ideal than living subjects. Those rare reports from someone who has had such living interactions are worth the weight of their subject in gold and are closely guarded and diligently copied.
A consistency across all reports are the substantial venom sacs. Similar to a snake or Gila monster, wyverns are highly venomous, able to fell creatures much larger than themselves. Dragons, hippopotamuses, elephants, and the giant sky beasts that live in a covering of cloud their entire lives are all supposed victims in a handful of reports.
(For good faith, the last one is only mention in a single, less than reputable, instance which also serves as the only record to the sky creatures actually being more than a supposition or mistaken classification.)
Less consistent overall are tail spikes. While they are always pointed, there seems to be a genetic split between those having venom in their tails and those not. The split doesn’t hold up to any one region such as north or south, dry or wet; nor does it match with the gender split. I feel this is one thing we will be unable to understand until living observations are made more consistently. The reigning theory, however, is it is a recessive trait.
For those who know of the animal mind trait possessed by some, it may see a sore excuse to say we cannot observe wyverns up close. Indeed, I thought the same when I first began to research the topic. The facts answer the question: wyverns live in inhospitable environments. Whether up on the tops of mountains, in the middle of the desert, or deep in the dense rainforests; it can be near impossible to find them.
Our known specimens, less than fifty in number, are only encountered when a single wyvern approaches the edge of its normal territory and into areas humans inhabit. From this pattern, we assume wyverns are primarily solitary. It is unknown if the overflow is a sign of a growing population or limited resources, something time will have to tell.
I would be remiss if I did not mention what little we do know about their elemental abilities. As mentioned, wyverns tend to stick to their own territories. This is important due to the fact a majority of the ones found are one of the four primary elements; fire, water, earth, and wind. While there are some examples of primary tier combinations of the elements, located in regions between the other element clusters, they are few and far between.
This is one of the only data points we have in support of the centuries-old belief all elements stem from these four originals. There are a few others to suggest this, also solitary creatures who do not stray far from their original location, and each one adds a small sliver to our knowledge about our worlds.

