The Black-headed Oriole (Oriolus melano cephalus).
The Black-and-yellow Grosbeak, male only.
What we may call imperfect magpie colouration, i.e. where the head becomes white, occurs in several species of birds. The head of a black species sometimes becomes white as a mutation; in the domestic Muscovy duck, for example, an individual is sometimes produced having a white head, although the black of the remainder of the plumage remains unchanged.
As examples of this scheme of colouration we may cite—
Black-and-white Fruit Pigeons (Myristicivoræ).
Several Gannets (Sula capensis, S. serrator, etc.)
Swallow-tailed Kite (Elanoides furcatus).
Several Storks (Euxenura maguari, Anastomus oscitans, Pseudotantalus cinereus).
Moreover, a common variety of the barn-door fowl has also a white body and black primaries and tail, showing that this scheme of colour may arise as a mutation.
A further elimination of black in the tail and body leads us to white birds with more or less black wings:—