<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/320x426/54cfd673bc1c6_-_pterosaurs-01-0414-de.jpg>
<http://www.popularmechanics.com/science/animals/g1804/5-things-you-should-know-about-pterosaurs/>