<http://schema.org/alternativeHeadline>
"DNA testing on a bear shot in Canada reveals that polar-grizzly bear hybrids are in fact interbreeding in the wild."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/stories/first-wild-polar-grizzly-bear-hybrid-offspring-discovered>