Population
Estimated population is 1,300 (2010) and decreasing.
Status EN
Brood-parasitism by Shiny Cowbird (Molothrus bonariensis), competition for nesting areas by Caribbean Martin (Progne dominicensis), habitat loss through clearance for agriculture, nest-predation by the Pearly-eyed Thrasher (Margarops fuscatus) and elevated mortality by introduced carnivores such as Indian Mongoose (Herpestes auropunctatus), are the main threats.
For more information see BirdLife International Species Factsheet.
Voice
Various, including whistles, squawks, squeaks and rasping notes.
Yellow-shouldered Blackbird (Agelaius xanthomus) [XC33702]
by from La Parguera, Puerto Rico, Puerto Rico (call)
Yellow-shouldered Blackbird (Agelaius xanthomus) [XC33703]
by Rainforest Connection from La Parguera, Puerto Rico, Puerto Rico (call, calls (two kinds))
Subspecies
Closely related to and possibly forming a superspecies with Tawny-shouldered Blackbird (Agelaius humeralis).
The following 2 subspecies are recognised:
xanthomus (Sclater, 1862) - Puerto Rico.
monensis Barnes Jr, 1945 - Mona I, off western Puerto Rico.