Veela

Veela are a race of semi-human, semi-magical hominids reminiscent of the Sirens of Greek mythology. Little is known about their biology; they appear to be young, beautiful human female caucasians. Their appearance and especially their dance are magically seductive to almost all male beings, which causes them to perform strange actions in order to get nearer to them. Hearing a Veela's voice can also cause one to incessantly brag in order to impress them, such as claiming they have invented a broom that can reach Jupiter. Veela are thought to have their own type of magic which does not require a wand. When Veela are angry, however, they transform into something more like Harpies — their faces turn into cruel-beaked bird heads and long scaly wings burst from their shoulders, and they can launch balls of fire from their hands.

Veela hair is a magical substance, suitable as a core for wand manufacture. Renowned wandmaker Ollivander noted that he personally never uses it, as the product tends to be temperamental.