Oahu Elepaio

The Oʻahu ʻelepaio (Chasiempis ibidis), a member of the monarch flycatcher family, graces the Hawaiian Island of Oahu with its presence. This avian species is distinguished by its rust-colored head and the white of its underside that extends to the flanks and further up the breast.

Identification Tips

When observing the Oʻahu ʻelepaio, look for the characteristic white underparts that reach up the breast and flanks. The head and upperside exhibit a more rust-colored hue, which sets it apart from its relatives.

Habitat

This bird is endemic to the island of Oahu, favoring the lush landscapes within the Koʻolau and Waiʻanae ranges.

Distribution

The Oʻahu ʻelepaio's range has become restricted to a mere 47 square kilometers within its native island. It is found in fragmented populations across this area.

Behaviour

The Oʻahu ʻelepaio has shown resilience in the face of widespread diseases such as avian malaria and fowlpox. It has been observed that in areas where rat populations are controlled, the survival and nest success rates of this species are significantly higher.

Breeding

The breeding biology of the Oʻahu ʻelepaio has been studied, revealing that rat predation significantly impacts the success of nesting, affecting eggs, nestlings, and adult females.

Conservation status

With a population estimated between 1,200 and 1,400 individuals, the Oʻahu ʻelepaio is classified as endangered. Conservation efforts are critical, especially for the windward side of the Koʻolau range, where only about 20 individuals remain, some valleys harboring a solitary ʻelepaio. Without intervention, this population is at risk of extirpation due to small population phenomena.