The majority of seabird-nesting colonies in the main Hawaiian Islands are located on the offshore islands, islets and rocks. One of those, Moku Manu (Bird Island), is three-quarters of a mile off Mōkapu Peninsula. The island is actually of two parts; the main western one is about 18 acres in extent and the smaller outer part is about three acres. It has a relatively flat top, averaging about 165 feet in height but running up to 202 feet. The cliffs of Moku Manu drop directly into the sea around more than half of the island.
It’s aptly named; it has the most diverse and one of the densest seabird colonies in the Main Hawaiian Islands. It is home to Uʻau Kani or Wedged-Tailed Shearwater, Noio or Black Noddy, Noio kōhā or Brown Noddy, ʻOu or Bulwer’s Petrel, Koaʻe ʻula or Red-tailed Tropicbird, ‘Ewa ʻEwa or Sooty Tern, ʻIwa or Great Frigatebird, Christmas Shearwater, Pākalakala or Grey-backed Tern, ʻā or Masked Booby, ʻā or Brown Booby, ʻā or Red-footed Boobies and various common shorebird species. The state designated it the Moku Manu State Wildlife Sanctuary.