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Galapagos Shearwater Images
The Galpagos Shearwater, Puffinus subalaris is a small shearwater. Until recently it was considered to be a subspecies of Audubon's Shearwater, but it is actually one of two members of a very ancient lineage of the small Puffinus species, the other being, as indicated by mtDNA cytochrome b sequence data, the Christmas Shearwater (Austin et al., 2004). It is an endemic breeder of the Galpagos Islands, and is largely sedentary, although individuals are commonly seen as far as the Oaxacan coast of Mexico.
The Galpagos Shearwater has dark brown upperparts, undertail and underwing flight feathers, the rest of the underparts plumage being white. It sometimes has a dark collar. Both sexes are alike, as are the young after fledging. It is a slender-bodied shearwater, about 2931 cm long, with a wingspan of around 63 cm and weighs 123-225 g. The species closely resembles the Tropical Shearwater, although the latter is typically blacker and has a longer tail.
The Galpagos Shearwater is a gregarious species and will feed at sea with other shearwaters and boobies. It flies low over the water and feeds on squid, fish and offal. It intersperses 4-10 stiff wing beats with shallow glides.