Breeding in the islands San Cristóbal, Santa Cruz, Santiago, Floreana, and Isabela, the Galapagos petrels (formerly called Dark-rumped Petrels) were decimated by introduced mammals, leading to their assessment as Critically Endangered on "the IUCN Red List of Threatened Species". The principal cause of mortality of eggs and hatchlings of the species was the introduced Black Rats. Introduced plants have also altered and restricted the nesting habitat. The reproductive period of the petrels covers about eight months of the year with an egg-laying period between March to the end of October.

Petrel, Galapagos