Galápagos Shearwaters

 
Shearwaters
Galápagos Shearwater, Puffinus subalaris

The Galápagos 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 Galápagos Islands, and is largely sedentary, although individuals are commonly seen as far as the Oaxacan coast of Mexico.

 

Galápagos Shearwater, Puffinus subalarisDescription

The Galápagos 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 29-31 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.

 

Behaviour

The Galápagos 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 (= entrails and internal organs of butchered animals).

It intersperses 4-10 stiff wing beats with shallow glides.

 

References

  • Austin, Jeremy J.; Bretagnolle, Vincent and Pasquet, Eric (2004): A global molecular phylogeny of the small Puffinus shearwaters and implications for systematics of the Little-Audubon's Shearwater complex. Auk (journal) 121(3): 847€“864. doi: 10.1642/0004-8038(2004)121[0847:AGMPOT]2.0.CO;2 HTML abstract
  • Onley and Scofield, Albatrosses, Petrels and Shearwaters of the World (Helm 2007) ISBN 978-0-7136-4332-9
 

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