Basically, all seven wyvern species are built the same way on the outside with some variations. The internal workings are mostly the same, though some have specialized organs that allow them to utilize their racial abilities and breath weapons.
They have boxy, serpentine heads topped with a bony crest. The neck is long and slender and attaches to a broad torso that slims out past the rib cage, becoming a long barbed tail. They have two muscular legs which act as both arms and legs at the front of their body. The leg shoulder is just past the bottom of the neck. From the above the arm shoulder, just shy of the back, is the wing shoulder. The wings are each split into five segments by thin bones that spread outwards from the wing’s elbow.
The legs each have three clawed toes at the front of the foot and a fourth at the back of the foot.
Each species has variations on this basic form.
Wyvern are egg layers. Clutches contain 3-8 eggs apiece. A female will carry the fertilized eggs inside her body for three weeks while she builds a nest or locates a suitable location to lay them in, depending on the species. Laying them takes a few hours. When she’s finished, the males in her harem stand guard over them, taking turns to guard and hunt for the others. Females always know which male in her harem sired the eggs but rarely does she share that information with anyone and never shares it with the males.
Eggs are universally leathery in texture. Size varies among species as does color, but the general rule of thumb for egg size is that the eggs will be 1/3 the size of their mother. At laying, they are 1/5 the mother’s size.
The eggs hatch two months later. Like all egg born creatures, the young wyvern will have consumed all of the material within the shell just prior to hatching. Young wyvern poses a special egg tooth on the end of their nose to help free themselves from the shell, as the shell is still quite tough. Some die from trying to break free. Those eggs are unassisted and are a blight on their mother’s reputation. It lowers her status among her clan considerably.
The egg tooth breaks off within a few days of hatching. Claws of young wyvern are soft and dull until they are a few months old. Once their claws have hardened, they begin to learn how to fly, a process which takes a minimum of 2 ½ months in order to properly build and strengthen the muscles. Instruction of the young is dependant on gender. Females are exclusively taught by their mothers and the males are communally taught by the males in the mother’s harem.
Wyvern are considered full grown and mature by the age of 8.