This confirms that Sumaili, at the Bronx, and thought at the time to be a Mountain Gorilla, was in fact graueri, because she came from Cordier.
I should probably know this, but were Mbongo & Ngagi [San Diego pre-war] graueri as I suspect?
So also was the young male 'PiliPili' which they obtained from Antwerp as a 'mate' for 'Sumaili' who had grown up with the Western Lowland male 'Mambo'. For a while Bronx then exhibited a pair each of Eastern Gorillas(Sumaili/PiliPili) and Western Gorillas (Mambo/Oka.) at the same time.
Mbongo and Ngagi were definately 'graueri' also.