<http://schema.org/alternativeHeadline>
"The monarch butterfly has one of the most spectacular annual migrations on the planet. But scientists worry that the migration may be coming to an end as fewer butterflies make it to their annual wintering grounds."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/stories/monarch-butterfly-numbers-hit-record-lows>