Copyright slashfilm
The Common Welsh Green are, as their name suggests, a dragon breed native to Wales, with the Ministry of Magic concealing their existence from Muggles (aka non-magical humans). Fortunately, most Common Welsh Green dragons prefer to prey on livestock and other small mammals, avoiding human contact if they can help it. That said, these dragons are fire-breathers, which does add to the danger that they potentially pose if they feel threatened. The book version of "Fantastic Beasts and Where to Find Them" lists a rare incident in 1932 when a Common Welsh Green attacked Muggles, which is outside of their usual behavior. In the main novels, the Common Welsh Green appears as part of the Triwizard Tournament in "Harry Potter and the Goblet of Fire." In the first challenge, with participants tasked with retrieving a dragon egg, Fleur Delacour must steal an egg from a Common Welsh Green. This pits her against the least dangerous dragon in the challenge, with Fleur using a sleeping enchantment to lull the dragon into a slumber. Even sleeping, though, the Common Welsh Green offers an incendiary surprise, setting Fleur's skirt on fire with a snore, which she extinguishes with a water spell.
