FAQ: what is the difference between psittacofulvins and psittacine?
There is no difference. Psittacofulvins AKA psittacine or parrodienes , [2, p. 242], [3, P. 380] is the class of pigments (red, orange, yellow) that is limited to Psittaciformes (parrots). In Europe in aviculture they prefer to use the more popular name psittacine (it started with the budgies). In scientific publications it is advise0d to use psittacofulvins.
 R. Morelli, R. Loscalzo, R. Stradi, A. Bertelli, en M. Falchi, “Evaluation of the antioxidant activity of new carotenoid-like compounds by electron paramagnetic resonance.”, Drugs Exp. Clin. Res., vol. 29, nr. 3, pp. 95–100, 2003.
 D. Van den Abeele, Lovebirds Compendium, 1ste dr. Warffum- The Netherlands: About Pets, 2016.
 E. Hill en K. J. McGraw, Bird Coloration. Volume 1. Mechanisms and measurements. Harvard University Press, 2006.