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. RowlingPeople ask me if there are going to be stories of Harry Potter as an adult. Frankly, if I wanted to, I could keep writing stories until Harry is a senior citizen, but I don't know how many people would actually want to read about a 65 year old Harry still at Hogwarts playing bingo with Ron and Hermione.
J. K. RowlingHe could tell at once that they carried different sorts of bubble bath mixed with the water though it wasn't bubble bath as Harry had ever experienced. One tap gushed pink and blue bubbles the size of footballs; another poured ice-white foam so thick that Harry thought it would have supported his weight if he'd cared to test it; a third sent heavily perfumed purple clouds hovering over the surface of the water. Harry amused himself for a while turning the taps on and off, particularly enjoying the effect of one whose jet bounced off the surface of the water in large arcs.
J. K. Rowling