Researchers using DNA profiles of seized ivory have been be able to trace most of it back to just two areas of Africa – Tanzania and northern Mozambique. The scientists say the data, published in Science, might increase international pressure to stop the killing. This week the US government will be sending out a strong message against the illicit trading of elephant ivory by destroying a tonne of it in New York's Times Square. It’s estimated that 50,000 elephants are being poached each year. Read more: bbc.co.uk