[2] The black-winged petrel is a pelagic species native to the East Pacific Ocean, living out at sea and only coming to land in order to breed.

[3] Outside the breeding season it migrates further north and most commonly occurs in a broad belt of ocean between Peru and Hawaii.

It digs a tunnel up to a metre (yard) long in sandy soil on a grassy slope inland from the shore.

It lays a single egg in a chamber at the end of the passage, lining the nest with leaves and other material.

This large population is spread out over a wide area and the IUCN, in its Red Book of Endangered Species, lists the bird as being of least concern.