The males of western African subspecies have a dark grey plumage.

As its name suggests, it has predominantly dark plumage.

They were ungainly things with dark red plumage and very long tails.

The dark plumage on their backs camouflages them from above.

Medium to large with hooked bills and usually black or similar dark plumage.

The young has black bill, dark brown plumage and buffy-white below.

The adult's whitish back contrasts with the otherwise dark plumage.

Most individuals have dark plumage which has a metallic luster.

The following species, all from Africa and mostly having dark plumage, have been placed in it:

This bird has dark brown plumage with white primaries.