Thanks for all the great advice. I'm going to Botswana in August(the dry season) and definitely will take a back up camera after hearing many stories re:failures. The vehicles are all open, not pop top, so that should make it easier to shoot. I don't want to take a tripod or too many extras because we are extremely limited as to weight since small aircraft are used to get from camp to camp. I definitely will start practicing and the zoo is a good idea, as opposed to my local squirrels.