Greyish Baywing
Agelaioides badius
The greyish baywing is 19 cm (7 in) long. Males weigh an average of about 46 g (1.6 oz) and females average about 42 g (1.5 oz). Both sexes of both subspecies have the same plumage though A. b. bolivianus is larger than the nominate A. b. badius. Adults have a mostly grayish buffy brown head, neck, and upperparts. They have blackish lores and ear coverts and an otherwise grayish buffy brown face. Their uppertail coverts are olive-brown and their tail very dark olive-brown. Voice: The greyish baywing sings "a quiet, musical continuum of warbles and trills, often in chorus". In flight both sexes give a "clear prolonged whistle peeeooh". Its primary call has been written as a "harsh, hoarse, guttural chuck", " a squeaky chayt, chap", a "weak kik errt, kik, riiie, kik krrr, krrr and tji drrrrrrt", and "a sharp clear tuit".
ID text from Wikipedia, CC BY-SA 4.0
Russet-backed Oropendola
Psarocolius angustifrons
Russet-backed oropendola males are 44 to 48 cm (17 to 19 in) long and females 34 to 38 cm (13 to 15 in). Males weigh about 250 to 470 g (8.8 to 17 oz) and females about 170 to 230 g (6.0 to 8.1 oz). Adult males have long feathers on their nape that form a crest and females do not; their plumage is otherwise the same. Adult males of the nominate subspecies P. a. angustifrons have an olivaceous-brown head and a mostly brown body and wings with a russet tinge. Their rump and uppertail coverts are paler russet-brown.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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