 In 2008, the ornithologists Storrs Olson and Edgar Maíz López cast doubt upon this identification, and proposed that the bone instead belonged to the extant imperial amazon ("Amazona imperialis").The size and robustness of the bone was similar to ulnae of the imperial amazon, and though it was worn, the authors identified what appeared to be a notch, which is also present on ulnae of the genus "Amazona", but not in the genus "Ara".Subfossil remains from the island of Montserrat have also been suggested to belong to the Lesser Antillean macaw.