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Even Zoo Animals Are Being Killed by Too Much Iron

Over the past decade around half the rare black rhinos in American zoos have died prematurely of chronic anaemia. Affected animals suffer from low blood cell counts, weakness and apathy and often pass blood in their urine shortly before they die. In humans, anaemia is caused by low levels of iron. But in rhinos, paradoxically, it may be caused by high iron levels, which catalyse the formation of oxygen free radicals that damage red blood cells. Researchers have found that black rhino blood...

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