Harry Potter: Professor. Your bird… There was nothing I could do. He just caught fire.
Albus Dumbledore: And about time too. He’s been looking dreadful for days. Pity you had to see him on a burning day. Fawkes is a phoenix, Harry. They burst into flame when it is time for them to die… and then they are… reborn from the ashes. Fascinating creatures, phoenixes. They can carry immensely heavy loads. Their tears have healing powers.
From Harry Potter and the Chamber of Secrets (2002)