I only saw that bird twice in Lake Nakuru National Park. The first time, it flew away. The second time, I managed a few pictures before it went away. I spotted a second one a bit further during the same game drive but it too flew away before I could get a decent shot.
Nikon D700, Sigma 150-500mm OS at 450mm, F6.3, 1/400s, ISO 1250, handheld.
Near Main Gate, Lake Nakuru National Park, Kenya