Both adults in general yellow/green; red forehead and forecrown; sometimes a few scattered red feathers on neck; red bend of wing, carpal edge and outer lesser underwing coverts, occasionally tinted with orange; yellow outer greater underwing coverts; green inner underwing coverts; variable red markings on thighs. Bill horn in colouration. Eye ring bare and buff/white. Eye orange.
As in adults but red on forehead and forecrown minimal or absent; dull olive outer greater underwing coverts; red on thighs absent. Eye grey.
Calls in flight are loud and raucous; also higher pitched whistles, squawks and chattering sounds. Nighttime at roosting site calls are loud, harsh and gutteral. Some nighttime calls more elaborate and song-like.
Content Sources:
Central Pets
Internet Bird Collection http://ibc.lynxeds.com/
Parrot and Conure World http://www.parrot-and-conure-world.com/parrot-species-comparison-chart.html
CITES http://www.cites.org/eng/resources/species.html
BirdLife International http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=1568&m=0
xeno-canto America http://www.xeno-canto.org/index.php
Parrots: A Guide to Parrots of the World, Juniper and Parr, 1998.
Parrots of the World, Forshaw, 2006.
Parrots in Aviculture, Low, 1992.
Psittacine Aviculture, Schubot, Clubb and Clubb, 1992.