The snail and the spider: a parable in the making

Don't look now, but there's a spider behind you.

When the tide comes in, the Marsh Periwinkle snails move up the Smooth Cordgrass so they won't drown. They also want to get out of the reach of crabs and other predators.

That's when you can get a good look at the one-inch snails.

Sometimes if you look closely, you may see a so-quick little spider messing with a so-slow snail.

The snail and the spider. What's the endgame here?

 When the water recedes, the snails will return to the ground to eat