America = coast of South Carolina.
Closely related to R. flavirostris and R. albicollis, and in past all three sometimes treated as conspecific. Races cinerascens and intercedens formerly considered to constitute two further species on account of white, as opposed to dusky, on wing-linings and tail, and amount of white edging on secondaries; variability of these characters is, however, more consistent with subspecific differentiation. Form oblita (coastal Guatemala) is regarded as a synonym of nominate; intermedia (W South America) normally included within cinerascens, and proposed race melanura is synonymous with cinerascens. Specific name changed from nigra to niger when all genera ending in -ops were ruled as being of masculine gender. Three subspecies recognized.
Food and feeding
Status and conservation
Only subscribers are able to see the bibliography. Login or Subscribe to get access to a lot of extra features!