Mystery Seagrass Circles in Croatia Puzzle Scientists

You've heard about crop circles, but what about seagrass circles? Aerial photos of the coastline of several islands in Croatia show regular circles of sand amidst a sea of Posidonia oceanica, a seagrass endemic to the Mediterranean

Biologist Mosor Prvan from the Sunce Association, a nonprofit environmental organization that first noticed the circles, doesn't have an explanation for the phenomenon. The circles are about 164 feet in diameter and are roughly at the same distance from the islands and from one another

"We've first seen the circles in aerial photos in 2013 while working on a habitat mapping project at the islands of Unije, Susak and Srakan," Prvan told Mashable Read more...