<http://schema.org/about>
"Most of the time, nature is pretty good at following the \"one baby, one head\" rule. But every now and then, something goes wrong and you get this."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/blogs/two-headed-baby-blue-shark-pulled-from-indian-ocean>