Yellow-Billed Egret

The yellow-billed egret of sub-Saharan Africa was considered a subspecies of the intermediate (or medium) egret of Asia until September 26, 2023 when it was separated into its own species by the International Ornithological Conference. It resembles the great egret, but has a smaller bill and a gape which does not extend beyond the eye. The gape is where the edges of the upper mandible and lower mandible of the bill meet. In breeding plumage it has long plumes on its back and breast and the yellow bill becomes orange-red. The yellow bill may have a black tip outside of breeding season. During breeding season the yellow lores turn green and the eyes change from yellow to bright red. 

I saw at least one yellow-billed egret in the Mabamba Swamp on Lake Victoria, Uganda. 

It is a little bit into breeding plumage, with yellow lores just a bit green and some plumes on the breast, but not the green lores and red bill of the illustration below. 

An illustration of a breeding plumage yellow-billed egret from Birds of the World. 

Range from Birds of the World.