'On the Sunday afternoon, there was a torrential rain storm and I had all but given up for the day. But around 4 pm, the rain and thunder stopped and the escarpments were slowly brought to life with shafts of low late light. And so it was that we left the comfort of our dry camp and in one precious moment, I had the perfect encounter with a male gelada in exactly the kind of spot I would have dreamt of. Better still, the rain had transformed his hair from its traditional style into an electrified one. A bit like my shot, Grumpy Monkey, from a few years back, freak weather has given the image the edge.'