Red Knots, Dunlins, Ruddy Turnstones, Sandpipers. The shorebirds were plentiful on the shores of the Mispillion River where it flows into Delaware Bay last week. The Horseshoe Crabs had arrived drawing thousands of birds seeking out the tiny crab eggs laid in the tens of thousands on the rocky shore. The massive flock would occasionally lift off, almost in unison, when a boat passed or a plane or predator flew over. The flock would fly a short distance, turn back, again in unison, and land back on the same shore.