The Hawaiian Goose or Nene is a protected species that is unique only to Hawaii. Once near extinction in the mid 1950’s (estimated as low as 24 total), its population has grown dramatically in the last ten years. It is now very common to see these geese at many of the golf courses in West Hawaii Island during the cooler months of November through January when they nest. We see a large number of them in the Waikoloa Beach Resort—especially by the waterfall across from Kolea.
Nene parents with their chicks:
(From Wikipedia) The nene (Branta sandvicensis), also known as Nēnē and Hawaiian goose, is a species of goose endemic to the Hawaiian Islands. The official bird of the state of Hawaiʻi, the Nene is exclusively found in the wild on the islands of Oahu, Maui, Kauaʻi, Molokai, and Hawaiʻi.
The Hawaiian goose named Nēnē comes after a soft call of his name after some training using treats from Observer.com. The specific name sandvicensis refers to the Sandwich Islands, an old name for the Hawaiian Islands.
It is thought that the Nēnē evolved from the Canada goose (Branta canadensis), which most likely arrived on the Hawaiian Islands about 500,000 years ago, shortly after the island of Hawaiʻi was formed. This ancestor is the progenitor of the Nēnē as well as the prehistoric Giant Hawaiʻi goose and nēnē-nui (Branta hylobadistes). The nēnē-nui was larger than the Nēnē, varied from flightless to flighted depending on the individual, and inhabited the island of Maui. Similar fossil geese found on Oʻahu and Kauaʻi may be of the same species. The Giant Hawaiʻi goose was restricted to the island of Hawaiʻi and measured 1.2 m (3.9 ft) in length with a mass of 8.6 kg (19 lb), making it more than four times larger than the Nēnē. It is believed that the herbivorous Giant Hawaiʻi goose occupied the same ecological niche as the goose-like ducks known as moa-nalo, which were not present on the Big Island. Based on mitochondrial DNA found in fossils, all Hawaiian geese, living and dead, are closely related to the giant Canada goose (B.c. maxima) and dusky Canada goose (B. c. occidentalis).
The Nēnē is a medium-sized goose at 41 cm (16 in) tall. Although they spend most of their time on the ground, they are capable of flight, with some individuals flying daily between nesting and feeding areas. Some are born without the ability to fly. Females have a mass of 1.525–2.56 kg (3.36–5.64 lb), while males average 1.695–3.05 kg (3.74–6.72 lb), 11% larger than females.
Adult males have a black head and hindneck, buff cheeks and heavily furrowed neck. The neck has black and white diagonal stripes. Aside from being smaller, the female Nēnē is similar to the male in coloration. The adult’s bill, legs and feet are black. It has soft feathers under its chin. Goslings resemble the male, but are a duller brown and with less demarcation between the colors of the head and neck, and striping and barring effects are much reduced.
Habitat and range
The Nēnē is an inhabitant of shrubland, grassland, coastal dunes, and lava plains, and related anthropogenic habitats such as pasture and golf courses from sea level to as much as 2,400 m (7,900 ft). Some populations migrated between lowland breeding grounds and montane foraging areas.
The Nēnē could at one time be found on the islands of Hawaiʻi, Maui, Kahoʻolawe, Lānaʻi, Molokaʻi, and Kauaʻi. Today, its range is restricted to Hawaiʻi, Maui, Molokaʻi, and Kauaʻi. A pair arrived at the James Campbell National Wildlife Refuge on Oʻahu in January 2014; two of their offspring survived and are seen regularly on the nearby golf courses at Turtle Bay Resort.
Ecology and behavior
The breeding season of the Nēnē, from August to April, is longer than that of any other goose; most eggs are laid between November and January. Unlike most other waterfowl, the Nēnē mates on land. Nests are built by females on a site of her choosing, in which one to five eggs are laid (average is three on Maui and Hawaiʻi, four on Kauaʻi). Females incubate the eggs for 29 to 32 days, while the male acts as a sentry. Goslings are precocial, able to feed on their own; they remain with their parents until the following breeding season.
The Nēnē is a herbivore that will either graze or browse, depending on the availability of vegetation. Food items include the leaves, seeds, fruit, and flowers of grasses and shrubs.
The Nēnē is the world’s rarest goose. It is believed that it was once common, with approximately 25,000 Hawaiian geese living in Hawaiʻi when Captain James Cook arrived in 1778. Hunting and introduced predators, such as small Asian mongooses, pigs, and cats, reduced the population to 30 birds by 1952. The species breeds well in captivity, and has been successfully re-introduced; in 2004, it was estimated that there were 800 birds in the wild, as well as 1,000 in wildfowl collections and zoos. However, there is some concern of inbreeding due to the small initial population of birds. The nature reserve WWT Slimbridge, in England, was instrumental in the successful breeding of Hawaiian geese in captivity. Under the direction of conservationist Peter Scott, it was bred back from the brink of extinction during the 1950s for later re-introduction into the wild in Hawaiʻi. There are still Hawaiian geese at Slimbridge today. They can now be found in captivity in every WWT centre. Successful introductions include Haleakala and Piʻiholo ranches on Maui. The Nēnē population stands at 2,500 birds.
The Nēnē is the state bird of Hawaii.