 The islands support the entire known breeding populations of two petrel species, Stejneger's Petrel "Pterodroma longirostris" (IUCN status VU) and the Juan Fernandez Petrel "Pterodroma externa" (IUCN status VU).In addition, the Juan Fernandez Islands may still support a third breeding petrel species, De Filippi's Petrel "Pterodroma defilippiana" (IUCN status VU), whose only other known breeding grounds are on the Desventuradas Islands.The Magellanic penguin breeds on Robinson Crusoe Island within the archipelago.