Urine from the rock hyrax which has crystallised over thousands of years is providing a previously untapped resource for studying climate change. The hyrax - common in Namibia and Botswana - is related to the elephant but looks like a guinea pig and uses specific locations as communal toilets, some of which have been used by generations for thousands of years. Now an international team of scientists are using stratified accumulations of urine - known as middens - to see what the hyrax used to eat.
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