Dragons are a large and powerful race from Akavir that were once very widespread throughout Tamriel. Although seeming rather beast-like, they are very intelligent and capable of language; their language can be used to cast powerful magic usable by a Dragonborn, but some dragons can speak other languages. Most dragons have been rendered almost extinct. However, dragons have recently resurfaced in Skyrim. There are six known races of dragon, unless you have the add-on of Dawnguard which increases to eight: black, frost, blood, elder, ancient, skeleton, revered and legendary dragons.
Dragon Gameplay Behavior
Although most commonly hostile, occasionally dragons will fly around you as if you're not there. Dragons will catch sight of something they wish to attack. Not all dragons may be hostile towards the player, Some dragons may be docile and harmless unless provoked.
Dragons may fly by you any time randomly. They will sometimes gang up on you in packs as you progress in skill and in the storyline.
Their combative patterns usually involve flyovers while shouting spells, hovering while shouting at you, and ground attacks. The sheer force of their landing can crush the ground around them. Ground attacks involve swinging their tails, using shouts, and attempting to bite with their jaws. If dragons successfully do enough damage to a player they can produce a finishing move by grabing half of the players body into their mouth, swinging them back and forth a couple of times, then lunching them in the air like a ragdoll.
Dragons will not land exclusively on open ground. They have been known to perch on buildings, cliffs, and rocky outcrops to gain a tactical advantage over the player.
(Credit for this" types" list goes to the The Elder Scrolls wikia andUnofficial Elderscrolls Pages wiki)