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.

ZweiSerpentine is one of the rare two-headed dragons that belong to the Shadows herds and they were raised from an egg stolen from the dragon caves. It was one of the more difficult grabs as split eggs are highly wanted by all dragon raisers. They live with the Shadows Serpentine herd and keep to themselves mostly as they are never truly alone as their two heads think independently of each other. From what the Shadows dragon raisers have observed, they rarely fight each other, but they usually take a while to make decisions as they discuss every action with each other. They are named Zwei because it means "two" in German and the other half of their name, Serpentine, indicates which herd they belong to within the Shadows herds.

The other dragons in the Shadows Serpentine herd aren't quite sure what to make of them except for the other two-headed dragons. The two-headed dragons in the Shadow herds tend to keep to their own kind.