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Storm-petrels (family Hydrobatidae) are diverse and widespread in the Pacific Ocean. Their breeding grounds are poorly known because they typically nest on islands, their nests are in burrows and crevices, and usually they attend their nests at night. Among the South Pacifi c species, Markham’s Storm-Petrel (Oceanodroma markhami (Salvin, 1883)) is listed as Data Defi cient by the IUCN (2012) because data on overall numbers, trends, and threats are not known. Only a few nesting sites on the Paracas peninsula (and offshore Isla Vieja) in Perú have been documented (Jahncke 1993, García-Godos et al. 2002) and therefore this species is considered endemic to Perú (Croxall et al. 2012). Here we present the fi rst record of reproduction of Markham’s Storm-Petrel in Chile, where it is categorized as endangered (Inadequately Known, SAG 2012). In April 2012, fellow entomologist Laurence Packer (York University) told us he heard seabird calls at night while crossing the desert. Between 14 and 17 June 2013 we surveyed that area for nests or other signs of activity. During the day, approximately 22 km southeast of Arica (Arica Parinacota region) above the Acha ravine, we found cavities in the saltpeter with fecal stains and a strong odor, some dismembered black wings, and a mummy of a Storm-petrel in a crevice. At night we heard vocalizations and saw several birds fl ying. We identifi ed the birds as Markham’s Storm-Petrel (Oceanodroma markhami) based on their size, long pointed wings, and a deeply forked tail. This species is dark sooty brown above, shading to blackish brown on the underparts with pale grayish brown upperwing coverts forming a distinct pale bar across the surface of the wing, which extends almost to the carpal joint. Wing flight feathers are almost black though the bases of the primary shafts look white. The underwing is blackish gray, and has a slight silvery sheen. The distal uppertail coverts are paler than the back, creating a slight contrast with the blackish tail (Murphy 1936, del Hoyo et al. 1992). Other dark brown storm-petrels with a pale wing bar are allopatric and dif fer in size (Murphy 1936, Harrison 1987). REVISTA CHILENA DE HISTORIA NATURAL

Breeding of Markham's Storm-Petrel (Oceanodroma markhami, Aves: Hydrobatidae) in the desert of northern Chile