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Nene (bird)

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The nene, or Branta sandvicensis, is a unique species of bird known as the Hawaiian goose. This bird is endemic to the Hawaiian Islands, meaning it is found naturally nowhere else on Earth. Today, wild populations live on the islands of Maui, Kauai, Molokaʻi, and Hawaii. Because of its cultural importance, the nene was named the official state bird of Hawaii in 1957. The name "nene" comes from the soft, gentle call the bird makes.

Physically, the nene is a large goose that has adapted specifically to its volcanic home. Adults possess black heads and hindnecks with buff-colored cheeks. Their necks feature distinct black and white diagonal stripes. The bill, legs, and feet of the bird are entirely black. One of its most interesting features is its webbed feet. These feet have evolved with receded toes to help the bird walk more easily on rough lava. While they can fly between nesting and feeding areas, they spend most of their time on the ground.

Branta sandvicensis MHNT.ZOO.2010.11.15.2
Branta sandvicensis MHNT.ZOO.2010.11.15.2

The evolutionary history of the nene is tied to the Canada goose, or Branta canadensis. Scientists believe the ancestor of the nene arrived in the Hawaiian Islands about 500,000 years ago. This arrival likely happened shortly after the island of Hawaii was formed. Genetic studies using mitochondrial DNA from fossils show that all Hawaiian geese are closely related to the giant Canada goose and the dusky Canada goose. This lineage also produced other extinct species, such as the nēnē-nui on Maui and the giant Hawaii goose on the Big Island. The giant Hawaii goose was massive, measuring more than four times the size of the modern nene.

Branta sandvicensis MHNT.ZOO.2010.11.15.2
Branta sandvicensis MHNT.ZOO.2010.11.15.2

Nene are herbivores, which means they eat only plant matter. They graze or browse on various types of vegetation depending on what is available. Their diet includes the leaves, seeds, fruit, and flowers of both grasses and shrubs. They live in many different environments, ranging from sea level to high elevations of 2,100 meters. These habitats include shrublands, grasslands, coastal dunes, and lava plains. They may also be found in human-made areas like pastures and golf courses.

Branta sandvicensis MHNT.ZOO.2010.11.15.2
Branta sandvicensis MHNT.ZOO.2010.11.15.2

The breeding habits of the nene are quite different from many other waterfowl. Their breeding season lasts from August to April, which is longer than the season for most other geese. Instead of nesting in water, nene mate on land. The female selects a nesting site and lays between one and five eggs. On Maui and Hawaii, the average is three eggs, while on Kauai, the average is four. The female incubates these eggs for 29 to 32 days. During this time, the male acts as a sentry to guard the nest. When the goslings hatch, they are precocial, meaning they can feed themselves immediately. They stay with their parents until the next breeding season begins.

Branta sandvicensis MHNT.ZOO.2010.11.15.2
Branta sandvicensis MHNT.ZOO.2010.11.15.2

The nene has faced a very difficult struggle for survival. In 1778, when Captain James Cook arrived, there were approximately 25,000 Hawaiian geese. However, hunting and introduced predators like feral cats, pigs, and small Indian mongooses caused the population to crash. By 1952, only 30 birds remained in the wild. To save them, conservationists used captive breeding. The WWT Slimbridge nature reserve in England was vital to this effort. Under the direction of Peter Scott, they bred the birds back from the brink of extinction during the 1950s. These birds were later reintroduced to Hawaii at places like the Haleakalā and Piiholo ranches.

Branta sandvicensis MHNT.ZOO.2010.11.15.2
Branta sandvicensis MHNT.ZOO.2010.11.15.2

Today, the nene is making a slow recovery, but it remains a very rare bird. In 2004, there were about 800 birds in the wild and 1,000 in zoos. By 2022, the population was estimated at 3,862 birds. This makes the nene the rarest goose species in the world. Scientists still monitor the population closely due to concerns about inbreeding from the small number of original survivors. NatureServe currently lists the species as Imperiled. Despite these challenges, successful reintroductions continue to help the nene reclaim its place in the Hawaiian ecosystem.

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