The Montezuma oropendola (Psarocolius montezuma) is a New World tropical icterid bird. It is a resident breeder in theCaribbean coastal lowlands from southeastern Mexico to central Panama, but is absent from El Salvador and southernGuatemala. It also occurs on the Pacific slope of Nicaragua and Honduras and northwestern Costa Rica. It is among the oropendola species sometimes separated in the genus Gymnostinops. The English and scientific names of this species commemorate the Aztec emperor Moctezuma II.
The sexes are very different in size; the male is 50 cm (20 in) long and weighs 520 g (18 oz); the smaller female is 38 cm (15 in) long and weighs 230 g (8.1 oz).
Adult males are mainly chestnut with a blackish head and rump, and a tail which is bright yellow apart from two dark centralfeathers. There is a bare blue cheek patch and a pink wattle, the iris is brown, and the long bill is black at the base with a red tip. Females are similar, but smaller than males with a smaller wattle. Young birds are duller than adults and have a paler and less demarcated bill. No subspecies are currently recognized. source