<http://schema.org/alternativeHeadline>
"Superman actor joins forces with the Durrell Wildlife Park in the UK to save species on the verge of extinction."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/arts-culture/blogs/man-of-steel-henry-cavill-launches-campaign-to-save-endangered-animals>