Thank you for the comments, much appreciated. I could not find any references to this bird outside Africa. I mentioned the almost violent reaction of the herons to the vicinity of an African Fish-Eagle. In the book I looked at they mentioned " Susceptible to kleptoparasitism by African Fish-Eagle" I have no idea what this is.
Thank you Rick, with your expertise in bird-photography I think you would have had a whale of a time in South Africa. I found the meaning for " Susceptible to kleptoparasitism by African Fish-Eagle". It refers to the stealing food instead of catching it him self.