@Gigit
I took this photo on the day the London Zoo Aquarium closed; the main purpose of my visit was to see the aquarium one last time.
I only saw "Kumbuka" for a few moments as I walked past the gorillas on my way to the aquarium. I didn't stop to watch him for long so, although he appeared less active than normal, I didn't appreciate anything was wrong. I certainly didn't realise that I'd never see him again.