Historically, efforts to estimate nesting populations of Leach’s Storm Petrel (Oceanodroma leucorhoa) have produced variable results. On Great Duck Island (GDI), census numbers for this species have ranged from 800 to 16,000 breeding pairs (Ambagis 2002). In the most recent census for GDI, Ambagis (2002) calculated that the island supports 9,300 + 6,500 pairs. The high degree of variation in these population estimates may reflect the patchy distribution of this species’ inconspicuous nesting sites, or burrows. To increase the accuracy of future census efforts on GDI, this study sought to refine a model that would account for the distribution of petrel burrows on the island.

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