-Sanderlings feed on invertebrates buried in sand, these invertebrates move into the upper layers to feed on the plankton and detritus that washes over them with each wave. As water retreats they are

Sanderlings feed on invertebrates buried in sand,

these invertebrates move into the upper layers to feed on the plankton and detritus that washes over them with each wave. As water retreats they are close to the surface