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Business Daily pays tribute to the working animals around the world. An estimated 200 million horses, donkeys, camels, elephants and other breeds form part of the global animal workforce - particularly in emerging markets. But those animals are often treated badly or have their lives shortened. So could putting a value on the work they do change the way they are treated? Manuela Saragosa hears from a charity for horses and donkeys in Senegal which is working out how much we owe to their labour. And the programme hears how rats from central Africa are outperforming dogs in one of the most dangerous jobs in the world. (Picture: Mine rat training in Tanzania. Credit: APOPO)