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.

When water dragons mature, they lose their legs and the ability to survive on land, entering the water permanently. They are adept swimmers and eat whatever fish are in the lake they live in. They tend to inhabit the same lake for their entire lives, although a few live in the ocean and swim all over the world.

The Devil of the Deep Dark Ocean is a name given by the island dragons to the mysterious giant water dragon that lurks in the deep waters around the island. Very little is known for certain, but in general, when one meets with this "devil," it is generally not a pleasant experience. The Devil of the Deep Dark Ocean knows no sense of morality, and is inclined to treat any he meets (which isn't often, as he usually stays at depth) in a number of ways depending on his mood.