<http://schema.org/alternativeHeadline>
"Researchers have found plenty of males calling for mates in drains, but they have yet to determine if female frogs prefer the calls from sewers over those from trees."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/stories/tiny-frogs-use-concrete-storm-drains-as-megaphones>