The Yellow-shouldered Blackbird occurs in Puerto Rico. Adults have glossy black plumage and a yellow shoulder patch that can be hidden when the bird is perched.
Adults are glossy black with a yellow shoulder patch. Immatures are duller blackish brown, including on the abdomen.
It forages for insects, seeds, and nectar on the ground and in trees in mangroves and dry scrub. It may breed in small colonies.
An extinction-risk assessment has not been added yet.