Rock iguanas in the Bahamas are under threat from tourists who feed them grapes, ground beef and other items not normally part of their herbivorous diet, according to a recent study by Charles Knapp, director of conservation and research at the Shedd Aquarium in Chicago. Knapp discovered diarrhea, parasite infections and abnormal levels of glucose, calcium, potassium and uric acid in iguanas commonly fed by humans. Knapp suggests tourists could feed commercial pelleted iguana food instead, which would promote the health and propagation of the species.

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