What is the world's largest living creature? Scientists from the CSIC. the University of the Balearic Islands, Portugal, Carribean and the USA have discovered a Posidonia Oceanica, of more than 8 kilometers in length, and 100,000 years old. The 'Posideonia Oceanica' is, in layman's terms 'sea grass', and the wavy plains of this plant found off the coasts Ibiza and Formentera, have been, since 1999, part of the reason for the award to Ibiza as a 'Heritage of Humanity'. The huge plant was discovered between 'Es Freus' (the straits that separate Ibiza from Formentera) and the 'Ses Salines' beach....and quite...