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Range DescriptionPuffinus auricularis breeds around Cerro Evermann on Socorro in the Revillagigedo Islands, Mexico. In 1981, there were an estimated c.1,000 pairs, with more found in the north of the island in 1990. In 1993-1999, the estimate was c.500 pairs (J. MartÃnez GÃ³mez in litt. 1998, 1999, 2000) and fewer than 100 breeding pairs could be located in 2008 (J. MartÃnez-Gomez in litt. 2007, 2008, 2009). However, 46,000 individuals (95% CI = 18,000-89,000), including 10,600 breeding birds, were estimated during at-sea censuses in 1980-1994 (Spear et al. 1995). It is clear that the breeding range has contracted, and threats indicate that numbers have declined. It formerly bred on ClariÃ³n and San Benedicto, but was almost certainly extinct on the former by 1988, and there has been no confirmed breeding on the latter since 1952. Birds seen immediately north of San Benedicto in 1988 and 1990 provide some hope that a population remains. In the non-breeding season, it forages largely in waters over the continental shelf of Mexico (Spear et al. 1995).