Found an original lithograph of the magnificent study of a Glaucous Macaw by M. Werner

I visited the Summer Fair of Fine Art and Antiques at Olympia in London yesterday and to my utter astonishment came across an original lithograph of the magnificent study of a Glaucous Macaw by M.Werner allegedly taken from a live specimen in the London Zoo in 1830, which appeared in Bourjot Saint-Hilaire's Histoire Naturelle de Perroquets, published in 1837-8. I saw this stunning portrait for the first time at the London Natural History Museum library  in 1991 when I was researching the Glaucous Macaw. Needless to say I could not leave the Olympia show without it. The photo I took of it today to replace the rather poor one I have used in the past on the website still does not do the original justice, but is definitely an improvement.  A close-up of the head has also been placed on the Glaucous Macaw images page.