Wyvern dragons

Wyverns are a type of dragon found in various planets, including Calpha, Exonia, and Galgamor. While wyverns are a subgroup of dragons, all wyverns share a common ancestor that is not shared by any other dragons. Their original homeworld is not known. They are distinctive in having two wings and two legs, and usually have claws on their wings and some manner of frill on their heads. They also consistently have four larger teeth on their upper jaws that are venomous. Other traits observed in some species of wyvern include breathing fire, changing skin color, and social/pack behavior. Nesting locations vary greatly, with some species preferring open plains, some flying or climbing high into trees or cliffs, and others settling on sandy beaches. Some wyverns have even been domesticated, most extensively in one southern Exonian pre-electronic culture where wyverns are used for battle mounts, in sport races, and for parcel delivery between cities.