Vespian's a custom species known as the Kruziik Nahlrii (translated "Ancient Beings"). A closed species crafted by both the user WanderBird and my own self. They are an illusive bunch and very scarce in numbers, originatin' as far back as the early 1600's. In a nutshell, they were once seen as spirit guides, Godly figures by the Native Americans. Nowadays their reputation has all but dwindled into the folly the Pilgrims and Settlers brought later on. Durin' their Dark Ages, so to speak, the species adapted into the arts of illusion once their kind dwindled on the brink of extinction, allowin' some the ability to disguise themselves to blend into the masses (not really shape-shiftin' but rather a Wolf's Rain thing goin' on).
Their massive in size, Vespian for example standin' at 14'2 feet tall, and each possesses different assortments of furs and traits. They are known, in English, as "Ancient Beings" for their immense life span. 20 years for a human = 1 year for a Kruziik Nahlrii. Thus, aye, they're far from realism and scarcely will a Kruziik Nahlrii- includin' Vesp- ever show who or what exactly they are to outsiders.
Figured to give a short summary rather than copy/paste down that 10-paragraph description I typed a few months ago.