I had written below but now suspect this bird is probably colored wrong for a Screaming Cowbird and that they can have the shape in this photo.
Identified as a Screaming vs Shining Cowbird by Cornell University's statement that "the bill of the Shiny Cowbird is relatively longer, with a narrower base, than the stubbier, more finch-like bill of the Screaming Cowbird". They also write that the Screaming Cowbirds have rounder heads.
Anguilla,Argentina,Bolivia,Brazil,British Virgin Islands,Canada,Chile,Colombia,Costa Rica,Cuba, Dominica,Dominican Republic,Ecuador - mainland,French Guiana,Grenada,Guyana,Haiti,Jamaica(I),Netherlands Antilles,Panama, Paraguay,Peru,Puerto Rico,Saint Lucia,Saint Vincent and the Grenadines,Suriname,Trinidad and Tobago,Uruguay,Venezuela,
IOC 9.1 Subspecies
s Florida (se USA), West Indies, the Guianas and n Brazil