The birds of the work
Each colour had its bird, though the authors did not always agree.
- The raven or crow for the black; the peacock's tail for the many colours after it; the swan or the dove for the white; the phoenix, reborn from its ashes, for the red. The pelican, said to feed its young with its own blood, stood for the red stone or for its multiplication.
- Paracelsus is credited with the bird that flies by night without wings, which takes on the peacock's tail, then the swan's wings, and at last the highest red.
- Some vessels were named after birds too: the pelican was also a still whose arms fed back into its belly.
Sources: Wikipedia, “Magnum opus (alchemy)”