<http://schema.org/about>
"City-dwelling male grasshoppers sing louder and at a higher pitch than their country kin so that their females can hear them over the din of traffic, suggests t"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/stories/traffic-makes-grasshoppers-sing-louder>