breeds only in the Galápagos Islands, Ecuador
. It is widespread throughout the archipelago, with possibly the most dense populations found at Puerto Ayora (Santa Cruz)3,5
, Puerto Baquerizo Moreno (San Cristóbal) and Puerto Villamil (Isabela)5
. In 1963, a survey of 56 km of coastline on the south and east of Santa Cruz found eight territories, which was extrapolated over the remaining coastline in the archipelago to give an estimate of 300-400 pairs. This was considered an overestimate. It has been suggested that the tiny population is probably a consequence of its confinement to linear feeding grounds of restricted range, which provide a limited food supply for much of the year4
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