Fawkes is a phoenix, Harry. Phoenixes burst into flame when it is time for them to die and are reborn from the ashes.
J. K. RowlingI was thinking the first thing we should do is Expelliarmus, you know, the Disarming Charm. I know it's pretty basic but I've found it really useful -" "Oh please," said Zacharias Smith, rolling his eyes and folding his arms. "I don't think Expelliarmus is exactly going to help us against You-Know-Who, do you?" "I've used it against him," said Harry quietly. "It saved my life last June." Smith opened his mouth stupidly. The rest of the room was very quiet. "But if you think it's beneath you, you can leave.
J. K. RowlingBidding the wizard farewell, he turned to his daughter, who held up her finger and said, “Daddy, look — one of the gnomes actually bit me!” “How wonderful! Gnome saliva is enormously beneficial!” said Mr. Lovegood, seizing Luna’s outstretched finger and examining the bleeding puncture marks. “Luna, my love, if you should feel any burgeoning talent today — perhaps an unexpected urge to sing opera or to declaim in Mermish — do not repress it! You may have been gifted by the Gernumblies!” Ron, passing them in the opposite direction, let out a loud snort.
J. K. Rowling