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Range DescriptionAcrocephalus brevipennis was once believed to be confined to Santiago, Cape Verde Islands, where it is now only locally distributed, mainly in the interior, with a few isolated sites in the south and west. It has apparently died out on Brava (no records since 1969 and formerly scarce) and was believed to have died out on So Nicolau (where it was formerly numerous). However, a previously unreported specimen collected on So Nicolau in October 1970 was discovered in the collection of the Centro de Zoologia, Lisbon, providing the impetus for a thorough search of the island (Hazevoet 1999a) and, in 1998, surveys located eight territories confined to the north-west of the island (though its long-term prospects for survival here are poor) (Hazevoet et al. 1999). In October 2004 a population was discovered on Fogo, and it has since been found to be widespread across the northern half of the island between 200-975 m, with the total population on the island conservatively estimated at 500 pairs (Hering and Hering 2005, Hering and Fuchs 2009). In addition, the species may have formerly occurred on Santo Anto (Hazevoet 1995). On Santiago, the species was recently reported from Tarrafal, far to the north of the species's known range (C.J. Hazevoet in litt. 2007). The total population was estimated at c.500 pairs in the early 1990s (Hazevoet 1995), and thought to number 1,000-1,500 birds based on its known range in 2007 (C.J. Hazevoet in litt. 2007). However the discovery of relatively large numbers on Fogo means that the total is probably considerably higher.