Harry Potter dragons make a big impression in the franchise, and ten known species of dragons exist. That number could have been bigger since there’s evidence of two other breeds rumored to have gone extinct. Dragons were beautiful creatures but almost impossible to domesticate, although Dragonologists attempted it. But the giant, fire-breathing beasts served more than one purpose for wizards and witches. Dealers were known to illegally sell and trade dragon eggs outside the sight of the Ministry of Magic. Wizards seek materials such as dragon blood, claws, horns, hides, and hearts for potions, clothing, and wands.