Biologic evolution

Why do it become a design interest taking a picture of the design
with interesting shell of the corbicula frequently?
I think that it is 2.3 pieces in the corbicula 75 kilos though it
doesn't know at how much probability to meet the corbicula of ..
interest.. design ahead of that.
Why do it become it?
It chose by force from among the garbage that entered with the
corbicula though it was my imagination though it did not understand
if the site was not seen.

It is a dead leaf.
I think that it was in Doro or sand.
The reason is that it is the same as the color of Doro, and discolors
to the black.
I think that this dead leaf has adhered to corbicula's shell.
It is a story of the imagination.