The bivalved mollusc Macoma is their preferred prey on European coasts, swallowing them whole and breaking them up in their gizzard.
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It is hypothesized that more recently, the birds have become threatened as a result of commercial harvesting of horseshoe crabs in the Delaware Bay which began in the early 1990s.
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CWF assists with the recovery of beach nesting bird species including piping plovers, least terns, black skimmers, American oystercatchers and red knots .
On the marshes and tidal flats thousands of birds occur, such as Common redshank, Barnacle goose, Spoonbill, Hen harrier, Oystercatcher, red knot, Bar-tailed godwit, Curlew and European Herring Gull.