Francois Levaillant. Histoire naturelle des perroquets. 2 volumes. Paris, Levrault frères bzw. Levrault 1801-05. Imperial Folio. (56,5:43 cm). With 145 magnificent colour printed plates touched up by Langlois after Jacques Barrabend. – One of the greatest books on parrots ever published. Coming up at auction on May 15th 2018 at Reiss & Sohn in Königstein.