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.

DuoSerpentine is a rare two-headed dragon stolen from the dragon caves and they live in the Shadows Serpentine herd. Most of the other dragons in the herd keep away from them as they are a testy pair and have two mouths of sharp pointy teeth. They seem to like each other well enough; they just seem to be unable to tolerate most other dragons. They usually go off by themselves to go hunting instead of spending time with the Shadows Serpentine herd and they do not accept food from any of the dragon handlers. Their name, Duo, means "two" in Latin which refers to their two heads and their second name indicates which herd that they belong to.

It has been observed by the dragon raisers that DuoSerpentine has been able to tolerate being around other two-headed dragons better than any other breed of dragon. This may explain why they only mate with other two-headed dragons.