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.

Two headed dragons are a special breed of dragons. They have two necks, two brains, two mouths, but one stomach and one main body. The two heads usually work together, but there are times when they will fight each other, attacking back and forth. They use their sharp teeth and wings to hunt large animals, and rarely eat plants. It is unknown what would happen if a two headed dragon were to mate with a one headed dragon, since it has never occurred. They only mate within their breed.

Thiadliaf spends all his time with his counterpart Thiadlenda, the light split dragon. Their favorite hobby is discussing science, history and philosophy. The two dragons are seen as the wisest dragons of the dragon group they live in, and are often asked for advice. They often have a different view though: Thiadliaf is mostly more conservative than Thiadlenda. And even then, the two heads of Thiadliaf often don't agree with each other. But they are happy about this, because it keeps the discussion alive. Thiadliaf and Thiadlenda have the most children of the whole dragon group, who now live in the wild or with other dragon owners. Thiadliaf's secret hope is to have grandchildren one day.