Each summer, approximately two million migrating shorebirds can be seen in the upper Bay of Fundy at Johnson’s Mills Shorebird Reserve near Dorchester as they make their way from the Arctic to South America. The Bay of Fundy is a crucial resting and feeding spot during their annual stopover. These tiny birds forage for mud shrimp at low tide and, as the tide pushes in, they are forced to the air where they gather in flocks of tens of thousands, weaving along the shoreline in an exquisite ballet of shadow and light. Each bird will eat an average of 10,000-20,000 mud shrimp at every low tide. Each shrimp is the size of a grain of rice. The mudflats can extend up to three to four kilometres. The shorebirds will stay in the area for an average of two weeks during which they need to double their weight in order to complete their 4,300 kilometre non-stop flight over the ocean that will take them an average of two to three days. Over 80 per cent of the world's Semipalmated Sandpipers flock to the nutrient-rich mud flats to line the shore of Johnson's Mills.