Lovely photos, can't help with the gorilla but wondering if you had a chance to see the chimps, I haven't been for a couple of years and am thinking of going to Antwerp very soon,
GorillaFollower - I did see the chimps, but didn't pay too close attention if I'm honest. I know when I first went to Antwerp the chimps were labelled as P. t. schweinfurthii but aren't any more - don't know if that's change of animals or change of opinion. The ones I saw first time were quite pale of face though, so it may well be the former.