Shorebirds are among the world's greatest migrants. Some birds travel over 15,000 miles round trip from their southerly non-breeding areas to their breeding grounds in the Arctic. While travelling north in the spring, shorebirds need to stop, rest and fuel up at stopover areas in order to continue their long distance journey. They are looking for mudflats that are teaming with abundant food like worms, tiny shrimp and other microscopic organisms.
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Most of the world's population of Western Sandpipers move through Grays Harbor estuary, some spending two to five days.