Recently, I was sitting on a rock, preparing to get in the water. There were a lot of little black bumps on the rocks, which I’ve seen before, but never really paid attention to. Except, this time, I noticed some of the bumps were moving.
These bumps are Black Nerite Snails which live just above the waterline. They’re about half-an-inch long and graze on small plants that grow in that zone.
Graham's Island 
These are very interesting. The shell is like periwinkle and clam put together.
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I thought so too. They’re quite small, the size of my little fingernail, but have lovely delicate markings.
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