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.

Dark green dragons, once they mature, appear to become an entirely different species. However, this isn't true. Rather, they burrow underground and get nutrients from their vines. These vines are sometimes referred to as Dragon Grass. These dragons are very violent, and will use their vines to capture, kill, and eat anything that moves, as well as nearby plants. Luckily, their range is limited and they cannot use magic. Dark green dragons tend to be easy to spot since they usually kill all plants around them and thus are usually surrounded by a large clearing.

Katarn is a Dark Green Dragon, found as an egg by Kaylani.  He was named Katarn because of Kaylani's fascination for the letter 'k', although, no one is sure why.  Since his parents were unknown, making him be considered as an orphan, he often helps Katniaria and Kaymaria in the outdoor nursery of Kaylani's house and garden, since he is partly underground as most Dark Green Dragons are.  He is complemented most the time, by Sky Wing Dragons that fly over the garden, of how courteous he is to Kaymaria and Katriania, and how he controls the plants in the garden, but most often accepts them with a slight nod, since he is not quite fond of praise.  Even though Dark Green Dragons are supposed to be vicious, Katarn has learned to control his ferocity, and is determined to prove them wrong, since he finds it offensive when someone mentions it, therefore, he has made it his mission to give the Dark Green Dragon a better reputation.