<http://schema.org/about>
"Snakes have infamously poor eyesight, which is why they resort to sticking out their tongues all the time."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/stories/coachwhip-snake-improves-its-vision-by-controlling-blood-flow>