Dragon eggs can be identified by their size alone. Some reach the height of a man's shoulder. Dragons are in the eggs for at least several months, with some incubating for 10 years. Each breed has a different type of eggshell. Although according to Sir Edward Howe, Chinese breeds are notoriously hard to categorize. Most of them have an appearance similar to porcelain.
In the wild eggs are buried under volcanos and hotsprings to kep them warm, but domesticated eggs are usually kept in warm places like the Ottoman furnace in BGW and under the heated courtyard at Loch Laggan covert in HMD.
Some African tribes believe that the spirits of departed ancestors are reincarnated as Dragons. This reincarnation is achieved through the methods used to care for Dragon eggs. Through a series of rituals and chanting, the egg is exposed to the beliefs and actions of a revered individual who has recently died. When the egg hatches these "memories" have become the Dragon's own and they regard them selves as the same person as the departed spirit that has been "called" to their egg.