Even Zoo Animals Are Being Killed by Too Much Ironhttp://articles.mercola.com/sites/articles/archive/2004/08/04/iron-zoo-animals.aspxVeterinary surgeons made a significant discovery that might have solved the mystery of why it's so difficult to keep the endangered black rhinos in captivity. Even though the numbers of rhinos that live in the wild has risen, the black rhino species hasenCommunityServer 2008.5 SP1 (Build: 31106.3070)