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Range DescriptionPterodroma arminjoniana breeds on Trindade and Martin Vaz Islands off the coast of Esprito Santo, Brazil. It was considered abundant on Trindade in 1913 and 1986 (Murphy 1936, Filippini 1986). Surveys in the mid-1990s have indicated that the Trindade population numbers 2,000-5,000 individuals (F. P. da Fonseca Neto in litt. 2000), and the global population was recently estimated at 15,000 individuals (Brooke 2004), although recent estimates suggest the total may be as low as 1,130 individuals (Luigi et al. 2008). Flocks have been noted flying around the Tunel, Po de Acar, Farilhes and Crista de Galo peaks, but the most probable nest-sites are inaccessible without specialist equipment (Filippini 1986). It was first recorded breeding on the Martin Vaz Islands (three small islands and several associated stacks 45 km east of Trindade) in 1924-1925, when it was abundant on the middle island (Murphy 1936), although there is no recent evidence of breeding at this site (Luigi et al. 2008). Also recently identified, from what was previously an unidentified Pterodroma species, to be breeding on Round Island, 22 km north of Mauritius, in the Indian Ocean (Brown and Jordan 2009). There have been confirmed sightings of several birds at sea in the central south Atlantic (490 nm northeast of Tristan da Cunha), off the Azores and a single sighting off Cape Verde Islands (Flood 2010). Records suggest they may regularly forage in the central north Atlantic and in small numbers as far east as the Macaronesian islands (Flood 2010).