Phoenixes are not limited to regeneration on Burning Day when they burst into flame and are reborn from the ashes. In Order of the Phoenix, Fawkes protects Dumbledore from the Killing Curse and is reborn. Also, the Basilisk has no effect on the phoenix.
don't look now because the basilisk is about to appear! really, don't look!
I mean, a dog'll bite if yeh bait it, won' it. But Thestrals have jus' got a bad reputation because o' the death thing. People used ter think they were bad omens, didn' they? Jus' didn' understand, did they? —Professor Rubeus Hagrid during a Care of Magical Creatures class.
a norwegian ridgeback just hatched on hagrid's kitchen table!