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.

Green dragons are also sometimes called "earth" dragons. They usually live deep within caves, and have power over the earth. They are capable of launching boulders at high speeds, and can cause earthquakes by slamming down onto the ground.

Terrafin is named for the ground she so enjoys moving.  She has a spectacular ability to move stones and large boulders, but so far has not been interested in doing so for any human's needs. Her keeper has hopes that Terrafin will one day decide to help in moving the cave's Stone Dragon, Speedy, out of the way when he chooses an inconvenient resting place. So far, Tarrafin has found this a laughable pursuit. She is a willing breeder, and has proven a fair surrogate for little Terrafini.