The Glaucous Macaw is paler and has a more greyish head.

The Glaucous Macaw is also probably extinct, with only two reliable records of sightings in the 20th century.

Some recent commentators have suggested that the allopatric Lear's Macaw and Glaucous Macaw should be considered conspecifics.

The Lear's Macaw is similar to the larger Hyacinth macaw and the slightly smaller Glaucous Macaw.

It includes two endangered species, the Hyacinth Macaw and Lear's Macaw also known as the Indigo Macaw, and one probably extinct species, the Glaucous Macaw.

The Glaucous macaw was extirpated in the 1800s by clearance for agriculture and cattle grazing of the Yatay palm (Butia yatay) groves upon which it fed, though rumors of its continued existence persist.

Here's the rub: if genetic fingerprinting proves this to be a real Glaucous Macaw, Harry and Robin fear the bird will be removed; but without that proof they will not be able to convince sceptics.

The Spix is one of the "four blues", the four species of all blue macaws formerly seen in captivity together including the Hyacinth Macaw, Lear's Macaw, and Glaucous Macaw (extinct).

Fellow aviculturalists 'don't call them twitchers, it's the ultimate insult,' said Yvonne, Harry's daughter Robin Pickering and Peter Banks from Stanhope were called in, and after much research and consultation they came to the extraordinary conclusion that this was a Glaucous Macaw.

Endangered species in Argentina include the ruddy-headed goose, Argentinean pampas deer, South Andean huemul, Puna rhea, tundra peregrine falcon, black-fronted piping guan, glaucous macaw, spectacled caiman, the broad-nosed caiman, Lear's macaw, the guayaquil great green macaw, and the American crocodile.

Glaucous Macaw, Anodorhynchus glaucus (critically endangered or extinct)

For example - Glaucous Gull, (Larus glaucescens) or Glaucous Macaw, (Anodorhynchus glaucus).

The Glaucous Macaw (Anodorhynchus glaucus) is a large all blue South American parrot, a member of a large group of Neotropical parrots known as macaws.