A small freshwater stream enters the tide zone on the Oregon coast.
In a nearby pool, mussels, barnacles and small snails carpet the rocks.
Above them young gooseneck barnacles have gotten a toehold among larger barnacles and the mussels. They are about an inch long. The grass-like fibrous strings are part of the mussels apparatus for affixing themselves to the rocks.
Above it all, oystercatchers survey their realm from the top of the food chain.