Piping plovers, federally-listed as threatened, arrive at the refuge between mid-March and early April. Once a full clutch of eggs has been laid, the refuge erects a wire exclosure around the nest. This keeps predators away from the nest, while allowing the birds to come and go. Interns monitor hatching and fledging rates. The heaviest use of the refuge by plovers occurs in July: not only nesting adults and their young, but also adults and fledglings from other areas forage and loaf there.