Periwinkles Making Tracks

Periwinkle. Can just see the tentacles coming out from the front of the shell.

Took a walk from Lower Largo along the disused railway line. Saw a yellow wagtail in the trees on the landward side of the path. Walked back along the beach as the tide was going out. Noticed there were tracked grooves in the sand, and then saw that it was the periwinkles that were making the tracks.

In this photo (above) can clearly see the track that the periwinkle has made.

Periwinkles attached to a nearby rock. The periwinkles on the move seemed to be going in the direction of this rock. (Click on photos to see larger images)