Dragons are creatures with nearly unlimited life spans. They can survive for long periods of time, and no one has found a dragon that has died of old age. Adolescence is usually marked by the growth of a hatchling's wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. Once they hit adolescence, hatchlings change quickly, maturing to their full forms in only 2 years.

Dragons don't communicate with each other verbally, but they will growl to scare off predators and frighten prey. Young dragons will emit an extremely high-pitched squeal when they are frightened. To communicate, they use telepathy with each other and to speak to other creatures.

Stone dragons have a tough outer covering made of a stone-like material. They eat rocks, using the minerals they contain for nourishment and to keep up their stone outer shell. They rarely move, and are the heaviest of all types of dragons. Although they have wings, indicating flight ability, no one has ever seen a stone dragon flying.

The stone egg, left near a pile of rocks, was just mistaken for a very nicely shaped rock by hatchling Ferreth. She put it in the sand that she put eggs in, just to decorate it. But she was surprised when it actually hatched into a very rocky dragon hatchling.

Zahth never really moves or speaks. Still, he manages to (quite literally) fit right into the Mayfly Cave - as guardian to the entrance and watchman over all that happens in the first room of the cave. He hides himself in a crevice of the wall, his glowing eyes the only thing distinguishing him from the rock.