How cloned horses conquered polo

Polo is one of the world's oldest team sports, believed to have origins that date back more than 2,000 years, in which two teams of horse riders compete to hit a ball against posts at either end of a playing field. It might not seem like a place for innovation - but over the past decade, polo has been transformed by the use of cloned horses.

At the heart of the cloning boom is Argentinian Adolfo Cambiaso, the man regarded as polo's greatest ever player. A decade ago, he took to the field with six identical horses, each cloned from his favourite mare, Cuartetera. Cambiaso and his cloned horses now dominate the sport - but what does that mean for the future of equine sports, and how far might people be willing to go in search of the "perfect" polo horse?

The BBC's Marnie Chesterton has been to Argentina to see the polo fields and scientific laboratories where this story has played out. She talks to Ed Harry about how the experiment began, the big money that it's attracted, and the ethical concerns it's raised.

You can hear Marnie's documentary, Game of Clones, in the BBC World Service's Documentary Podcast.

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