<http://schema.org/alternativeHeadline>
"As the endangered Sumatran rhinoceros teeters near extinction, scientists are racing to maintain a premier captive breeding population at the Cincinnati Zoo."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/blogs/to-save-species-zoo-may-mate-rhino-siblings>