The diversity of sand grain types is a function of the immediate location of the turtle nesting beach. It is logical that the size, direction and intensity of the waves crashing upon the shore is also a highly local phenomena. The combination of the two converge to make a “song”, unique to that beach. Female turtles memorize that song while still within their egg and it is that memory that drives them to return to lay their eggs on the very beach upon which they were born. Visit this website and enjoy sand grain diversity!