|A po'ouli phototographed by Paul E. Baker|
Casey & Jacobi, 1974
Casey & Jacobi, 1974
The poʻo-uli (Melamprosops phaeosoma) is a critically endangered and possibly extinct bird species that is endemic to Hawaiʻi. It is considered to be a member of the Hawaiian honeycreepers, and is the only member of its genus Melamprosops. It has been called black-faced honeycreeper.
The poʻo-uli is brown above and grayish-white below, with a broad black mask extending behind the eye. Adults are silvery-gray above the mask, shading into brown at the crown, with a bold, pale patch just behind the mask. Juveniles are similar but buffier below with a smaller mask and without gray above. Most earlier published images of the poʻouli were of the juvenile plumage.
Discovery and taxonomy
The poʻo-uli was not discovered until 1973 by students from the University of Hawaiʻi, who found the bird on the north-eastern slopes of Haleakalā on the island of Maui. It was found during the Hana Rainforest Project at an altitude of 1,980 metres (6,500 ft) above sea level. The poʻo-uli was the first species of Hawaiian honeycreeper to be discovered since 1923. It is dissimilar to other Hawaiian birds. Evidence based on DNA suggests it belongs to an ancient lineage of Hawaiian honeycreepers. It appears to have outlived all its close relatives; that is if it had any close relatives. No other bird – living or fossil – has a structure similar to it.
Status and conservation
|This section needs additional citations for verification. (November 2012)|
In the past, according to fossil records, it seems that the bird lived on the dry half of the island of Maui, across southwestern slope of Haleakalā at altitudes of 275–1,350 metres (902–4,429 ft). When the species was first discovered, 100–200 poʻo-uli were estimated to exist. There were only 76 birds per km2. By 1981, there were only 15 birds per km2. By 1985, there were only 8 per km2. That meant that from 1975, when it was first discovered, to 1985, only ten years later, the population had dropped by over 90 percent. In the 1980s, the poʻo-uli disappeared from the easternmost part of its range and was only found in the western branch of the Hanawi Stream.
To preserve the poʻo-uli and other endangered fauna and flora, the State of Hawaii established the 9,500-acre (38 km2) Hanawi Natural Area Reserve. This connected several protected areas to make one larger protective area. This protection effort was only possible due to the work of several groups: the government, Maui County, the National Park Service, The Nature Conservancy, and several private companies. The land was fenced off and by June 1996 they began to clear out the pigs from the closed areas. Four years and 202 pigs later, the poʻo-uli pen was completely cleared of pigs. As more pigs were removed from the other two pens, population of native species that lived there, e.g. the Maui parrotbill and ʻākohekohe, rose slightly faster than they otherwise would have. Rats, cats, and goats were still being removed from the poʻo-uli pen.
By 1997, only three individuals were known to exist. These had home ranges within the Hanawi Natural Area Reserve and the adjacent Haleakala National Park.
In 2002, one of these, a female, was captured and taken to a male's home range in an attempt to get them to breed. The female, however, had flown back to her own territory, which was 1.5 miles (2.4 km) away, by the next day. There was also a ten-day expedition in 2004. The goal of this was to capture all three birds and bring them to a bird conservation center on the island, in the hope they would produce offspring.
On September 9, 2004, one of the remaining birds, a male, was captured and taken to the Maui Bird Conservation Center in Olinda, in an attempt to breed the bird in captivity. However, biologists could not find a mate for the male before it died on November 26, 2004.
If the two remaining birds still survive, they are at least ten years of age, nearing the end of their life, and probably have not been fertile for a few years. It is uncertain whether they are a male and female, or both are of the same sex. Since 2004, extensive surveys have failed to locate these or other individuals of this species and it could be extinct, but remains listed as critically endangered by BirdLife International (and thereby the IUCN) until additional surveys have confirmed its extinction beyond reasonable doubt. Tissue samples have been taken from the male captured in 2004 for possible future cloning.
The dramatic population decline has been attributed to a number of factors, including habitat loss, mosquito-borne diseases, predation by pigs, rats, cats, and small Asian mongooses, and a decline in the native tree snails that the poʻouli relied on for food.
The poʻo-uli bird is referenced in a lounge-inspired number, less elegy than celebratory memorialization, "Poʻo-uli", appearing on John Zorn's album O'o (another extinct endemic bird species of Hawai'i) along with a number of other Hawai'iana tracks and bird songs of species illustrated on the album's cover. The personnel on the sessions compose a New York underground supergroup, consisting of Mark Ribot, Trevor Dunn, among others.
- BirdLife International (2013). "Melamprosops phaeosoma". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Etymology: "black-faced bird with brownish body". Melamprosops, "black-faced", from Ancient Greek melas (μέλας) "black" + prosopo (πρόσωπο) "face". phaeosoma, "brownish-bodied", from Ancient Greek phaios (φαιός) "brown-gray" + soma (σώμα) "body".
- Powell, Alvin (2008) The Race to Save the World's Rarest Bird - The Discovery and Death of the Poʻo-uli, Stackpole Books: Mechanicsburg, PA, p.26.
- BirdLife International (2007b): Poʻo-uli - BirdLife Species Factsheet. Retrieved 2007-AUG-28.
- Phalen, D.N., Groombridge, J. (2003). Field research in Hanawi: A story about working with the world's most endangered bird. Journal of Avian Medicine and Surgery 17:39-42
- Pukui, Mary Kawena & Elbert, Samuel H. (1986): Hawaiian Dictionary. University of Hawaiʻi Press, Honolulu. ISBN 0-8248-0703-0
- VanderWerf, Eric A.; Groombridge, Jim J.; Fretz, J. Scott & Swinnerton, Kirsty J. (2006): Decision analysis to guide recovery of the po‘ouli [sic], a critically endangered Hawaiian honeycreeper. Biological Conservation 129: 383-392. doi:10.1016/j.biocon.2005.11.005 (HTML abstract)
- Species factsheet - BirdLife International
- Article in the Honolulu Star-Bulletin about the poʻouli
- BBC story