https://www.pottermore.com/features/harry-potter-pets-we-wish-we-could-adopt
Fawkes
So what would make our list for the most insane demands on a pet bird? Pretty plumage, check. Ability to carry immensely heavy loads, check. Magical tears with healing powers, check. But about that inevitable time when your beloved bird grows old and tired? No worries — he’ll just be reborn as a tiny chick, even supplying his own pyrotechnics for the occasion.
The phoenix is an awesome creature. So awesome, in fact, Dumbledore even named the Order after it. Its American relative, the Thunderbird, is admittedly pretty nifty too. Fawkes, Dumbledore’s own phoenix, has all this going for him along with unfaltering loyalty and a gorgeous singing voice. Trust Dumbledore to find a pet as brilliant as himself.