Hawaiian petrel Hawaiian petrel The Hawaiian petrel or uau ("Pterodroma sandwichensis") is a large, dark grey-brown and white petrel that is endemic to Hawaii. The Hawaiian petrel was formerly found on all the main Hawaiian Islands except Niihau, but today it is mostly restricted to Haleakalā crater on Maui; smaller populations exist on Mauna Loa on the island of Hawaii, Waimea Canyon on the island of Kauai, Lānaihale on Lānai, and possibly Molokai. It is also reportedly seen on the Galapagos Islands. Their diet consists of 50–75% squid, and smaller percentages of fish and crustaceans. The birds nest in burrows or rock
Northwestern Hawaiian Islands introduced to Laysan and Lisianksi, where they multiplied and devoured most of the vegetation, permanently extinguishing several species. However, most of the damage was reversed, and the islands were restored largely to their pre-exploitation state. Some of the endemic species of the NWHI include the Nihoa and Laysan finch, the Laysan duck (the "rarest native waterfowl in the United States"), and the Nihoa fan palm. Other notable species are the Laysan albatross, the highly endangered Hawaiian monk seal, and the green sea turtle. The only native trapdoor spiders in the Hawaiian archipelago ("Nihoa" spp.), recently discovered, are found only here.