Entry on the Glaucous Macaw in The Parrots of South America (Page 44) by Rosemary Low published in London in 1972.

GLAUCOUS MACAW (A.glaucus)
Description: Slate-blue with a greyish tinge to the head and neck and a browner tinge to the breast. The flights and the underside of the tail, also the under wing-covens, are blackish. The naked skin surrounding the eye and at the base of the lower mandible is yellow. The bill is black. Length: about 28in.

Distribution: South-eastern Brazil, Paraguay, Uruguay. According to de Schauensee (33b) there is no authentic Argentine record for this macaw.

Remarks: An extreme rarity in aviculture.