I'm going to give you some basic information about a few famous mythical creatures and then I'll give my own zoology lesson on these creatures. Since they are mythological and to some extent they can be used in a story how you see fit; my zoology lesson will be primarily made up of my own thoughts, not facts.
Dragons: A reptilian-like beast. It may or may not have wings. Lays eggs, may or may not breathe fire. Different world cultures have different interpretations of this mythical animal. A dragon can utilize different elements, hold different forms and can be either helpful or harmful.
Unicorns: A mythical creature, similar to a horse. Has one horn, no wings. Innately good, and in most folklore has healing powers.
Phoenix: Fire bird. Lives a long life then dies in flames. Rises anew from the ashes, either as the same bird or from an egg laid in the nest where the bird dies. Eternal symbol of resurrection. Has the power to regenerate when wounded.
Pegasus: A mythical creature, similar to a horse. Has no horns, has wings. May be helpful, may be wild and need to be tamed. Not naturally mean, but may be mischievous.
Griffin: Body of a lion, head, wings and talons of an eagle. Lion is the king of beasts and eagle is the king of birds so a griffin can be seen as the king of all creatures. Known to guard treasure.
Jenny's Zoology of Mythical Creatures
If a pegasus and a unicorn mate and the baby is a female it would be called a uni-sus, if the baby is male it would be a pega-corn. If a uni-sus and a unicorn mate and the baby is female it would be a uni-uni-sus, if the baby is male it would be a uni-sus-corn. If a pega-corn and a unicorn mate and the baby is female it would be a uni-pega-corn, if the baby is male it would be a pega-pega-corn. Interesting, huh?
Griffin's love guarding things, like churches and castles. But please don't ask a griffin to guard your sub sandwich, it's beneath them and you should know better.
Dragons tend to be lazy creatures who would prefer to take the easy way out of situations. They will smash, burn or eat things instead of figuring out a logical way to solve a problem. In one known instance, a dragon smashed, burned and ingested a rubix cube.
It is said that if a Ford Firebird flies off a cliff and bursts into flames, then a phoenix was behind the wheel.
Top five names for a unicorn:
5. Bo Jangles
3. GLAAD Float Extra
2. Waste of Space
1. Glorified Horse