This is about an islet off Easter Island

Easter Island

Easter Island is a Polynesian island in the southeastern Pacific Ocean, at the southeasternmost point of the Polynesian triangle. A special territory of Chile that was annexed in 1888, Easter Island is famous for its 887 extant monumental statues, called moai, created by the early Rapanui people...

 not Motu Iti (Marquesas Islands)
Motu Iti, or Little island is a small uninhabited islet

Islet

An islet is a very small island.- Types :As suggested by its origin as islette, an Old French diminutive of "isle", use of the term implies small size, but little attention is given to drawing an upper limit on its applicability....

 near Motu Nui

Motu Nui

Motu Nui is the largest of three islets just south of Easter Island and is the most westerly place in Chile. All three islets have sea birds but Motu Nui was also an essential location for the Tangata manu cult which was the island religion between the moai era and the Christian times...

, about a mile from Rano Kau

Rano Kau

Rano Kau is a tall extinct volcano that forms the southwestern headland of Easter Island, a Chilean island in the Pacific Ocean. It was formed of basaltic lava flows in the Pleistocene with its youngest rocks dated at between 150,000 and 210,000 years ago.- The crater :Rano Kau has a crater...

 on the south western corner of Easter Island

Easter Island

Easter Island is a Polynesian island in the southeastern Pacific Ocean, at the southeasternmost point of the Polynesian triangle. A special territory of Chile that was annexed in 1888, Easter Island is famous for its 887 extant monumental statues, called moai, created by the early Rapanui people...

, a Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

an island in the Pacific.

Nowadays it is a bird sanctuary and part of the Rapa Nui National Park

Rapa Nui National Park

Rapa Nui National Park is a World Heritage Site located on Easter Island, Chile. The park is divided into seven sections:*Rano Kau *Puna Pau ....

 but until the late nineteenth century CE

Common Era

Common Era ,abbreviated as CE, is an alternative designation for the calendar era originally introduced by Dionysius Exiguus in the 6th century, traditionally identified with Anno Domini .Dates before the year 1 CE are indicated by the usage of BCE, short for Before the Common Era Common Era...

 it was important to the Rapanui

Rapanui

The Rapa Nui or Rapanui are the native Polynesian inhabitants of Easter Island, or Rapa Nui, in the Pacific Ocean. The easternmost Polynesian culture, the Rapa Nui people make up 60% of Easter Island's population, with some living also in mainland Chile...

 people both as their best source of obsidian

Obsidian

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth...

 for sharp edged tools and for an annual harvest of eggs and fledglings from the seabirds that nested on it. Motu Iti is the summit of a large volcanic mountain which rises over 2,000 meters from the sea bed.

Seabird

Seabird

Seabirds are birds that have adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding niches have resulted in similar adaptations...

s nesting on Motu Iti include the Sooty Tern

Sooty Tern

The Sooty Tern, Onychoprion fuscatus , is a seabird of the tern family . It is a bird of the tropical oceans, breeding on islands throughout the equatorial zone. Colloquially, it is known as the Wideawake Tern or just wideawake...

.