This was the very last picture and one of my favourites of a one hour session. Just as I’d taken the picture I'd become distracted while securing a footing, he came quickly forward, surprising us and nearly knocking me sideways. Stepping shin deep into mud to avoid him, he brushed by, splitting our group of eight on the way through.

He is the second silverback of the Kwitonda Group, in the Parc des Volcans in Rwanda, which we visited in March 2008.

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