Just seen a scientific paper which seems to indicate something rather interesting:
"Of the blue macaws of the genus Anodorhynchus, A. hyacinthinus is the largest and occupies open areas in CS South America, mainly in Brazil. The smaller A. leari and A. glaucus occurred in quite similar habitats in east and southern South America, both being considered critically endangered. Anodorhynchus leari occurs in northern Bahia State, Brazil, and A. glaucus was distributed in southern South America, being originally found in southern Brazil, Paraguay, Uruguay and northern Argentina, now extinct at least in most of these areas. These species differ only in rather subtle plumage characters whereas there are no osteological differences between them. Fossils found in caves of the states of Bahia and Minas Gerais, between the historically known ranges of A. leari and A. glaucus suggest that the blue macaws of E South America had a contiguous distribution until at least 10.000 years ago, so A. leari is best treated as a subspecies of A. glaucus."
If this is taken as fact, the glaucous macaw hasn't gone extinct because it is the same species as the Lear's macaw.
Not suggesting what I said makes me the bad guy.
but im glad i discovered a new bird i never heard about before.
