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20-23cm (8-9 inches)
 Similar Species
The Greater Antillean Oriole has more yellow. Greater Antillean Grackle has a longer tail which folds in a V-shape and lacks yellow in the wing. Shiny Cowbird male has a purple sheen and lacks yellow in the wing; the female is not black.
There are 2 subspecies:
Mainly mangroves and dry scrubland.
Feeds on insects, seeds and nectar, which it takes both on the ground and in trees.
They breed in small colonies, building neests both in crevices and tree forks.
 Conservation Concerns
Yellow-shouldered Blackbird has been described as being common in the 1940s, but habitat degradation and nest parasitism from the Shiny Cowbird, which reached Puerto Rico in the 1940s, forced the population down quite dramatically, to a low of about 1000 birds.
The population on Mona Island is less affected by the cowbird because they often nest in cliff crevices which the cowbird does not visit.
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