Dragonling
Newly-hatched dragons are roughly the size of a deer and voraciously hungry. They live for a short time in their mother's lair before venturing out on their own. The slender, wingless creatures are born in vast numbers, as only a few ever make it to adulthood.
Drakes
Male dragons never develop into the winged monsters of myth. At most, their forelegs grow the vestigial spurs where wing membrane might have been. Once they have fully matured, males immediately seek out the lairs of adult females. When they find one, they move into her lair and spend the rest of their lives there, hunting for her and defending her young. They will aggressively defend her nest, and many would-be dragon hunters have been lost to their fiery breath and crushing blows from their tails.
Dragons
Female dragons take much longer to mature than their male counterparts. They too undergo a metamorphosis of sorts at adulthood; But while males lose the use of their forepaws, females actually grow a third set of limbs specifically to serve as wings. Young females travel great distances looking for a suitable nesting site. Because of their nomadic habits, these are the dragons most frequently encountered by man.
High Dragon
A fully mature adult female dragon is the high dragon: the great monster of legend, the rarest of all dragonkind. These dragons hollow out massive lairs for themselves, for they need the space to house their harem of drakes as well as their eggs and the dragonlings.
High dragons are seldom seen. They spend most of their time sleeping and mating, living off the prey their drakes bring back. But once every hundred years or so, the high dragon prepares for clutching by emerging from her lair and taking wing. She will fly far and wide, eating hundreds of animals, most often livestock, over the course of a few weeks and leaving smoldering devastation in her wake. She then returns to her lair to lay her eggs and will not appear in the skies again for another century.