No interactions present.
Black legs rule out WRH as does the relatively slender bill.
I don't have first-hand knowledge of these, but the race gularis of Western Reef Heron apparently has black legs and bill in breeding plumage. Might be worth checking?
The avibase checklist for Mozambique does not have dimorpha...
How reliable that is, I don't know.
My Flickr photos...
http://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=7C15B36BB2B59CF... clearly has E. dimorpha present in Mozambique.
I am also looking very much at the bill Ian. E. g. schistacea has a notably heavy bill whereas this bird has a relatively dainty one also “..never black.”; Zimmerman, Turner, Pearson Birds of Kenya and Northern Tanzania.
Useful that Avibase contradicts itself!
You'll know the species better than I do, Ray, so I was only adding to the debate, not suggesting gularis was right. I found a reference that said ssp. gularis, from Africa, had a black bill in the summer...can't remember which book it was, though, now! If you reckon the bill is too thin, then it is looking like dimorpha.
I need to get a guide to herons and egrets...a gap in my library!
I had another look with a bird watching friend and she agrees with the Dimorphic Egret identification.
Thanks all for your input!
Lat/Lng: -14.7, 40.7
Seen on the beach, feeding.