In Africa, the giant fig tree and the tiny fig wasp differ in size a billion times over, but neither could exist without the other. Their extraordinary relationship is a marvel of co-evolution, a marriage which has lasted for millennia. It forms the basis of a complex web of dependency that supports entire ecosystems, providing food for thousands of creatures, from elephants, giraffes, and fruit bats, to forest hornbills, monkeys, insects, and fish.

• BBC
• Ian Holm