Galapagos Shearwater

The Galápagos shearwater, Puffinus subalaris, presents itself as a small, slender-bodied avian marvel, with a length spanning approximately 29–31 cm and a wingspan reaching around 63 cm. The average weight of this species ranges from 123 to 225 grams. Its plumage is a study in contrast, with dark brown upperparts, undertail, and underwing flight feathers, while the rest of the underparts are a pristine white. Occasionally, one may observe a dark collar adorning its neck.

Identification Tips

Upon sighting, one can identify the Galápagos shearwater by its size and coloration. Both sexes and fledged young share a similar appearance. It can be distinguished from its relative, the tropical shearwater, by its less blackish hue and a shorter tail.

Habitat

The Galápagos shearwater is an endemic breeder to the Galápagos Islands, where it has adapted to the unique coastal environment.

Distribution

While largely sedentary in nature, the Galápagos shearwater is known to venture as far as the Oaxacan coast of Mexico, a testament to its resilience and adaptability.

Behaviour

This gregarious species often congregates with other shearwaters and boobies to feed at sea. It exhibits a flight pattern characterized by a series of 4-10 stiff wing beats followed by shallow glides, skimming low over the water's surface.

Diet and Feeding

The diet of the Galápagos shearwater is composed of squid, fish, and offal, which it skillfully captures from its low-flying vantage point above the sea.

Conservation status

The Galápagos shearwater is currently classified as Least Concern on the IUCN Red List, indicating a stable population within its natural habitat.