I assume by that name you mean Corythaixoides personatus?
In which case, I was referring to the hbw.com taxonomy which has split the species into the population in Ethiopia, C. personatus, the Brown-faced Go-away Bird, and the population in Tanzania and areas in surrounding countries, C. leopoldi, the Black-faced Go-away Bird.
(HBW also lists Bare-faced Go-away Bird in the other common names section 'when lumped with leopoldi')
No, I meant leopoldi. I haven't heard the name "Black-faced" before and I thought you'd typed it by mistake. Other organisations (IOC & eBird, for instance) use Bare-faced, as do the field guides.
