Eodraco

The Eodraco (or dawn dragon, in a dead language) was a genus species of prehistoric proto-dragons. Many scholars believed eodracos were the first proto-dragon species.

Description
According to information taken from incomplete fossil evidence, eodracos were similar in form and appearance to present age wyverns, with an average height of 35 feet (10 mts.) long and a 50-foot (15 mts.) wingspan, with no evidence suggesting eodracos had a stinger on its tail like wyverns.

Due to the size of its skull, it was also believed their brains were smaller than those of wyverns, making them less intelligent than those creatures, but biggest than those of behemoths, making eodracos more cunning than its contemporaneous species.

History
It was widely believed by scholars from Candlekeep that eodracos were a divergent evolved species from prehistoric behemoths, although they were never numerous enough to outnumber them. Due to its improved animal cunning, they developed the ability to anticipate and plan, and to cooperate with other members of their species, making them a successful species in a time dominated by powerful behemoths of carnivorous species.

It was theorized that their cunning and relatively small height enabled eodracos to survive the cataclysmic events that caused the mass extinction of nearly all species of behemoths. Most scholars believed this cataclysm was the Tearfall (although many counter-theories existed), and due to the harsh climatic change Toril suffered in its wake, eodracos were forced to undergo a series of process of rapid evolution in order to survive, eventually evolving into a huge variety of proto-dragon sub-species.