is endemic to Socorro in the Revillagigedo Islands, Mexico
. It was the most abundant and widespread landbird in 1925, and was still abundant in 1958. By 1978, it had declined dramatically and was feared on the verge of extinction. Subsequent surveys have estimated the population at 50-200 pairs in 1988-19901,5,8
and c.350 individuals in 1993-1994, with the highest densities in the sheep-free dwarf forests of Cerro Evermann3
. Of 170 birds ringed in 1994, 56% were subadults3
, suggesting that productivity is high and the population would be capable of increasing if habitat quality improves across the island9
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