On a gorilla trek in Bwindi, Uganda, we spent a magical half hour with the "bweza" family ("pretty" in the local dialect). With these magnificent gentle giants on the verge of extinction - only a few hundreds left in the wild - the experience was extremely emotional. Silverback was relaxing after a major rain and thunderstorm only hours earlier. Even though he seems like he's suffering from indigestion, all the picture shows is the tail end of a yawn.