There is the interesting white-necked guineafowl, Agelastes (which is found on the Gold Coast and elsewhere west of the lower Niger); there is one peculiar species of eagle owl (Bubo lettii) and a very handsome sparrow-hawk (Accipiter bitttikoferi); a few sun-birds, warblers and shrikes are peculiar to the region.
The Ecuadorean owl is the Bubo nigrescens.
The existing genera include Anas, Aquila, Bubo, Columba, Cypselus, Lanius, Picus, Phalacrocorax, Sula, &c. Very interesting is the fact that Serpentarius, Psittacus and Trogon are amongst this list of birds, which are now restricted to the tropics.
The socalled Egyptian eagle owl (Bubo ascalaphus) is rather rare, but the barn owl is common.
From the fact that bacilli are hardly ever found in the blood of bubonic cases it may be inferred that they are arrested by the lymphatic glands next above the seat of inoculation, and that the fight - which is the illness - takes place largely in the bubo; in non-bubonic cases they are not so arrested, and the fight takes place in the general circulatory system, or in the lungs.
A bubo is found to consist of a chain of enlarged glands, surrounded by a mass of engorged connective tissue, coagulated blood and serum.
Among the birds of prey may be mentioned, besides the cinereous and bearded vultures, the Spanish vulture(Gyps occidentalis), the African or Egyptian vulture (Neophron percnopteras), which is found among all the mountains of the Peninsula, the Spanish imperial eagle (Aquila Adalberti), the short-toed eagle (Circaetus gallicus), the southern eagle-owl (Bubo atheniensis), and various kites and falcons.