I don't know about an Ethiopian fly, but a zebu is a breed of cattle with a large hump.
Zebub is the fly. You see it in the word “beelzebub” or “lord of the flies” the first part, “beel” is a cognate of the word “Baal” a middle-eastern god.
Sorry, the zebub is the fly, the zebu is the ox.
Must study dictionary harder!