<http://schema.org/alternativeHeadline>
"Overfishing, perceived threats to humans and the animals' slow reproduction rates have led to a steady decline in population."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/stories/sharks-and-rays-on-the-brink-25-at-risk-of-extinction>