The Festive Amazon, also known as the Festive Parrot, is very similar to other Amazona parrots, but can be distinguished by their dark reddish lores and eyebrow.  Their red rump is also a distinctive field mark, though this is difficult to see when the bird is perched.

A Festive Amazon (Amazona festiva) in the Botanical Gardens, Georgetown. (Photo by Kester Clarke/www.kesterclarke.net)
A Festive Amazon (Amazona festiva) in the Botanical Gardens, Georgetown. (Photo by Kester Clarke/www.kesterclarke.net)