So why did the Africans never domesticate the rhino? Why did they never farm the hippo? The elephant? Or the giant wildebeest? Perhaps most strangely of all, given the importance of the horse to ...

With a large barrel-shaped body, short legs and huge skull, the hippo is the third largest land animal in the world. Adult bulls can reach 4–5m long and weigh four tonnes (4,000kg). Theyhttp ...