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    Piping plovers: a few feathery facts

    David L. Ryan/Globe Staff

    Piping plover populations deemed threatened and endangered in 1986

    Length of piping plover: 7 inches

    Piping plover incubation period: 27-28 days

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    State-required buffer zone around nests: 200 yards

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    2012 statewide plover population: 675 pairs

    2012 statewide productivity: 0.75 per pair

    Estimated chicks per pair needed to maintain population: 1.2 per pair

    2010-2012 average productivity in Duxbury: 1.3 chicks per pair

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    SOURCES: US Fish & Wildlife Service; Duxbury Harbormaster Coastal Natural Resources Department; Scott Melvin, director of state Natural Heritage and Endangered Species Program

    Sources: US Fish & Wildlife Service; Duxbury Harbormaster Coastal Natural Resources Department; Scott Melvin, director of Natural Heritage and Endangered Species program in the state Division of Fisheries and Wildlife