This photo was taken by myself on Inkonka Game farm, Limpopo South Africa, and shows a pair of Phymateus Viridipes more commonly known as African Bush Grasshoppers, Vertically clinging to the bark of a resident acacia tree while mating. (no, the small grasshopper is not getting a piggy-back ride...)
Here is a bit more information about the characteristics of these insects in an exert from a Wikipedia page.
"It is about 70 millimetres (2.8 in) long at maturity and capable of long migratory flights. Its body and fore-wings are green in colour while the hind-wings are bright red and blue, presenting a striking appearance in flight.
The pronotum, or dorsal area immediately behind the head, is covered in spines or carbuncles which are often tipped with red." ~ source