Quoted from Animal Kingdoms: Wildlife sanctuaries of the world, National Geographic Society 1995, pages 13-15 and 36:
The writer rode a motorbike through Africa from Capetown to Cairo several decades ago and had tantalizingly few glimpses of wildlife. He discovered that one could only tour the parks in a 4-wheel vehicle—no 2-wheelers allowed.
Following the motorcycle ride of my student days, and aware of a saddle’s imperfections, I chose a hydrogen balloon as my next vehicle for traversing Africa. From the comfort of its basket, I had hoped to watch the great herds stroll beneath the first such craft ever to come their way. In truth, when the flights began, the romance was often difficult to detect, as great thermals treated us like thistledown. We were bounced a mile or more above the ground, and our landings were bruisingly memorable.