Apparently they loose their hood during part of the year, which is medium to dark grey. If you want to license this photo for lots of money, I will gladly remove the gull in the right background, which I find a little distracting. I can live with the one in the back left.
Algeria,Angola,Argentina,Benin,Bolivia,Botswana,Brazil,Burkina Faso,Burundi,Cameroon, Central African Republic,Chad,Congo,Democratic Republic of Congo,Ecuador - mainland,Egypt,Equatorial Guinea,Ethiopia,Gambia,Ghana, Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Madagascar,Malawi,Mali,Mauritania, Mozambique,Namibia,Niger,Nigeria,Paraguay,Peru,Rwanda,Senegal,Sierra Leone,Somalia, South Africa,South Sudan,Spain,Sudan,Swaziland,Tanzania,Togo,Tunisia,Uganda,Uruguay, Western Sahara,Zambia,Zimbabwe,
IOC 9.1 Subspecies
coastal Ecuador and Peru, coastal c Brazil to Argentina