My pictures are far from the clear shots of an expert photographer so please accept my apologies.. I will try again with my simple camera. I may get lucky one day.
I've always thought that it is a big black bird with red wings and a head crest. After consulting with my colleague who is a bird watcher, he positively identified it as a Turaco and the next picture gave more details. It is in fact greenish on top, and has white bands around the eyes. My colleague explained to me that the bird appeared black because I was always watching it from below against the light!!