Hawaiian Goose

Branta sandvicensis
Nene
The Hawaiian goose - also known locally as "nene", is the rarest goose in the world. This goose is a little different from other geese because of its sedentary life. It does not undergo harsh weather. Its wings are not strong because it does not migrate, in fact, it does not fly outside Hawaii. As it hardly ever swims, its feet are just partially webbed. Instead, its toes and legs are longer than those of other species, which enables it to climb over the rocky terrain of Hawaii and to walk without waddling, as geese typically do.
2,500

population size

20-24 yrs

Life span

1.5-3 kg

Weight

41 cm

Height

53-69 cm

Length

Disrtibution

Native to the Hawaiian Islands, the Hawaiian goose today is most found most commonly on Hawaii, in and around the Hawaii Volcanoes National Park, and on Maui in Haleakala National Park. A large and increasing population also lives on Kauai Island, and the animal has recently been reintroduced on Molokai Island. They inhabit a range of habitats, including scrub forests, grasslands and volcanic slopes with sparse vegetation.

Habits and lifestyle

Hawaiian geese are diurnal. They sleep on the ground, their feet tucked under their bodies. The immediate family: a mating pair with their children, is the most tightly-knit social unit. Hawaiian geese may live in flocks of as many as 30 birds, some groups being more loosely formed than others, with nests from as close by as 45 meters to some very far away. Dominance ranking depends on the family unit’s size. Males defend against other geese the territory that immediately surrounds their nests and families. Their wings being 16% smaller than those of the Canada goose, their closest relative, they are not very good fliers. However, they fly from one island to another, usually taking off from the land. They do swim, mostly in ponds and lakes. They spread oil, using their beak, from their oil gland onto their feathers to waterproof them.

group name

flock, gaggle, skein, wedge

Diet and nutrition

Hawaiian geese are herbivores and forage on land only. They eat leaves, grasses, berries, flowers, and seeds.

Diet

Mating habits

Hawaiian geese are monogamous, forming life-long pair bonds. From August through April is the breeding season, peaking from October to March. These birds nest in solitary pairs and the nest is built by the female, being a shallow scrape in the ground, lined with vegetation and down, usually sheltered by tussock grass or rock. The same site is often reused year after year by the same pair. 2-5 creamy white eggs are laid, and the female incubates them for about one month. The goslings are precocial and can feed themselves, but usually remain with their parents for one year. They fledge at around 10-12 weeks old, and around 2-3 years old they are sexually mature.

Mating behavior

Reproduction season

August-April with the peak in October-March

Incubation period

1 month

Independent age

1 year
goose

female name

gander

male name

gosling

baby name

2-5 eggs

Clutch size

Population

Population Trend

Population status

ne
dd
lc
nt
vu
en
cr
ew
ex

Population threats

The main threat to Hawaiian geese is lack of a suitable habitat, as well as introduced species such as mongooses, and feral cats and dogs, which prey on young birds and eggs. Disease transmission and inbreeding depression may also be threats for captive-reared birds.

Population number

According to the IUCN Red List, the total population size of the Hawaiian goose is 2,500 individuals, including 250-999 mature individuals. This species is classified as vulnerable, but its numbers are increasing today.

Ecological niche

Hawaiian geese are important for spreading seeds for a great number of the plants that they eat. They are also important as a source of food for many of the animals that are their natural predators.

Fun facts for kids

  1. The Hawaiian goose has been Hawaii’s official state bird since 1957.
  2. The typical call of the Hawaiian Goose is a low, plaintive sound, similar to the local name of this species “ne ne”.
  3. A group of geese is known, among other names, as a "blizzard", "chevron", "plump", "knot", or "string" of geese.
  4. Hawaiian geese evolved from Canada geese, which probably came to the Hawaiian Islands around 500, 000 years ago, soon after Hawaii was formed.
  5. "Goose" is, in fact, the word for a female goose, males being called ganders. Geese on water or land in a group are called a "gaggle", in the air, a "skein".
  6. A goose's beak is serrated on the inside, and so is its tongue. This can make it look like they have fangs, but the serrations are for cutting succulent grass stems.
  7. In Victorian England, a goose accompanied a chimney sweep, and was sent down the chimney for the purpose of collecting the build up of coal, emerging at the bottom black with soot.
  8. Goose feathers were used to stuff some of the early golf balls. These were handmade and very expensive.