The Wedge-tailed Shearwater (Puffinus pacificus) is a common seabird in the Hawaiian Islands, breeding from Kure Atoll in the northwest to offshore islets near Maui in the south (Richardson 1957, Harrison 1990, Whittow 1997, Spear and Ainley 1999, Pyle and Pyle 2009). The highest concentration of breeding Wedge-tailed Shearwaters is in the northwestern Hawaiian Islands, where Pyle and Pyle (2009) estimated over 228,000 pairs. The largest colonies are on Laysan (150,000 pairs), Nihoa (35,000 pairs), and Lisianski (20,000 pairs) (Harrison 1990, USFWS 2005, Pyle and Pyle 2009). In the southeastern Hawaiian Islands, the population of the Wedge-tailed Shearwater has been estimated at roughly 67,000 pairs, with the largest colonies on O’ahu (30,550 pairs) and Ni’ihau (25,000 pairs) (VanderWerf et al. 2007, Pyle and Pyle 2009). The goals of our study were to estimate the number of Wedge-tailed Shearwaters fledging in 2010 on Tern Island, the main island in the atoll of French Frigate Shoals, in the northwestern Hawaiian Islands, to identify common nesting habitats in relation to vegetation cover and soil type, and to investigate differences between natural and artificial nests in fledglings’ weight and date of fledging.