Shell - Giant Clams

Habitat:

Sea.

Notes:

That a really big giant clams shell length more than 50 cm length and 30 cm in width. See #3 to get idea how big it is. I just found it when I walked on the beach on Small Tidung Island (Pulau Tidung Kecil). I'm amazed with unusual rock, I check it and got it a big clam shell or any else. I don't check if it come from 2 shell or not.