# Goose — Facts, Threats & Conservation

*Family Anatidae (Anser and Branta)*

> A goose is a large, social grazing waterfowl in the family Anatidae, split mainly into grey and white geese (Anser) and black geese (Branta). Bigger than ducks, geese feed on grass, form lifelong pair bonds and migrate long distances in energy-saving V-formations.

**IUCN status:** Varies; common species Least Concern (IUCN)  ·  **WARN range:** Europe, Asia, North America, Africa, Australasia

## Quick facts
| Fact | Value |
| --- | --- |
| Common name | Goose (plural: geese) |
| Main genera | Anser (grey/white) and Branta (black) |
| Family | Anatidae (waterfowl, with ducks and swans) |
| Typical length | About 74-110 cm, depending on species |
| Wingspan | Roughly 1.5-1.8 m in large species |
| Weight | Around 3-4 kg in common species |
| Diet | Mainly grasses, leaves, grain and aquatic plants (grazer) |
| Migration | Many species migrate in V-shaped skeins |
| Social life | Mostly monogamous, often paired for life; flock outside breeding |
| Lifespan | Often 10-24 years in the wild (Canada goose) |

## Scientific classification
- **Kingdom:** Animalia
- **Phylum:** Chordata
- **Class:** Aves
- **Order:** Anseriformes
- **Family:** Anatidae
- **Subfamily:** Anserinae
- **Genera:** Mainly Anser (grey/white geese) and Branta (black geese)

## Conservation status
- **Status:** Conservation status varies by species. Many of the most familiar geese, including the greylag goose (Anser anser) and the Canada goose (Branta canadensis), are assessed by the IUCN as Least Concern, with large and often increasing populations. Resident Canada geese are so numerous in places that they are widely treated as urban pests. Some more specialised or restricted-range geese, however, face pressure from wetland loss, drainage, hunting and disturbance, so not all species are equally secure.
- **Population:** Not meaningful as a single figure; common species number in the millions, while a few specialised geese have far smaller populations.
- **Trend:** Stable to increasing for widespread generalist species such as the greylag and Canada goose; declining for some specialised wetland geese.
- **Assessed:** Greylag and Canada goose assessed as Least Concern in recent IUCN Red List assessments
- **CITES:** Not generally listed; common geese are not CITES-restricted, though some specific species may have trade protections
- Because goose covers many species across two main genera, status is best read species by species rather than as a single category.

## Key facts: Goose
- Geese are large grazing waterfowl, classed mainly in the grey/white genus Anser and the black genus Branta within the duck family Anatidae.
- They fly in V-shaped formations that conserve energy and help the flock stay in contact during long migrations.
- Geese are largely herbivorous grazers, cropping grass, leaves, grain and aquatic plants, though they take some small invertebrates too.
- Most pair for life and defend territory only during the short nesting season, when they raise downy goslings.
- The greylag goose is the wild ancestor of most domestic goose breeds, kept by people for thousands of years.
- Common species such as the greylag and Canada goose are listed as Least Concern, and resident Canada geese are often treated as urban pests.

## What does a goose look like, and how is it different from a duck or swan?
Geese are medium-to-large waterfowl that sit between ducks and swans in size. A greylag goose measures roughly 74-91 cm long with a wingspan of about 147-180 cm, while a large Canada goose can reach 75-110 cm with a wingspan up to around 185 cm. They have long necks (though shorter than a swan's), heavy bodies, broad wings and webbed feet, and a stout, deep-based bill with serrated edges suited to gripping and cropping vegetation. Compared with ducks, geese are bigger, longer-necked and spend far more time grazing on land; both sexes usually share similar plumage, unlike the bright drakes of many ducks. Plumage varies by group: Anser geese tend to be grey-brown or white with pink or orange bills and legs, while Branta geese, such as the Canada and barnacle goose, are boldly patterned in black, white and grey. Swans, by contrast, are larger again, with very long necks and almost always all-white or all-black adult plumage.

## Why do geese fly in a V-formation?
The V, or skein, is one of the most recognisable sights in the bird world, and it is a feat of aerodynamics. As each goose flaps, its wingtips shed swirling vortices of air; birds flying slightly behind and to the side can ride the rising part of that wake, gaining lift and reducing the effort needed to stay aloft. By trailing one another in a staggered line, the flock as a whole saves energy on long journeys. The formation also aids communication and lets every bird keep its flock-mates in view, which matters when migrations can span continents. Geese share the demanding lead position and rotate through it, and much of a migration is actually spent resting at traditional stopover sites, where birds refuel and build fat reserves before the next leg. Young geese learn these routes and stopovers from their parents, so migratory knowledge is passed down the generations rather than being purely instinctive.

## What do geese eat and how do they live?
Geese are primarily herbivores and dedicated grazers. They feed chiefly on grasses, sedges, leaves, roots, aquatic plants and agricultural grain such as wheat, corn and rice, using the serrated edges of their bills to tear and crop vegetation. Some species also take small quantities of insects, molluscs, crustaceans and occasionally tiny fish, especially when feeding goslings that need protein to grow. Socially, geese are strongly bonded: most are monogamous and stay together as pairs throughout the year, becoming territorial mainly during the short nesting season. They nest on the ground near water, and both parents help guard the brood of goslings, which can walk and feed themselves soon after hatching. Outside the breeding season geese gather in large, noisy flocks, and a group has many traditional names: a gaggle on the ground, and a skein, team or wedge in flight. Their loud honking calls help coordinate these flocks and warn of danger.

## Are geese endangered, or are some a nuisance?
Most familiar geese are not threatened. Widespread species such as the greylag goose and the Canada goose are assessed as Least Concern by the IUCN, with large, often increasing populations. In fact, the opposite problem is more common in towns and cities: non-migratory Canada geese, which stay put where winters are mild and predators few, are widely regarded as pests. Their droppings foul parks and waterways, they graze and trample crops and amenity grass, they can be noisily aggressive when nesting, and they readily beg for food. Management can involve hazing, egg treatment to limit breeding, and culling. Not every goose is so secure, though. Some species and local populations face pressure from habitat loss, drainage of wetlands, hunting and disturbance, and a few island or specialist geese have small ranges. The broad pattern is that adaptable, generalist geese thrive alongside people, while more specialised wetland species depend on the health of the marshes, estuaries and tundra they need.

## Goose vs swan: how to tell them apart
| Feature | Goose | Swan |
| --- | --- | --- |
| Size | Medium to large | Larger, among the biggest waterfowl |
| Neck | Long but proportionate | Very long and graceful |
| Plumage | Grey-brown, white, or boldly black-and-white | Usually all-white or all-black as adults |
| Bill | Stout, deep-based, for grazing grass | Long, with a knob or coloured base in many species |
| Feeding | Mostly grazes on land | Feeds mainly in water, often up-ending |
| Family | Anatidae (genera Anser, Branta) | Anatidae (genus Cygnus) |

## Goose Breeds Guide
From the Embden and Toulouse to the African, Chinese, Pilgrim and four more — explore 8 of the world's most searched domestic goose breeds with temperament, size, common health issues and responsible care guidance.

Full breed library (8 guides): https://worldanimalrescuenetwork.org/wildlife-guides/goose#breeds

- **Embden:** Large white German goose — the classic farmyard 'guard goose' and table bird. — https://worldanimalrescuenetwork.org/wildlife-guides/goose/embden
- **Toulouse:** Massive grey French goose — the foundation of foie gras lines and heritage farm flocks. — https://worldanimalrescuenetwork.org/wildlife-guides/goose/toulouse
- **African:** Brown swan goose with distinctive knob — hardy, upright and distinct from greylag-derived breeds. — https://worldanimalrescuenetwork.org/wildlife-guides/goose/african
- **Chinese:** Swan-necked lightweight goose — prolific layer and vigilant flock guard. — https://worldanimalrescuenetwork.org/wildlife-guides/goose/chinese
- **Pilgrim:** Auto-sexing grey and white goose — males pale, females grey as adults. — https://worldanimalrescuenetwork.org/wildlife-guides/goose/pilgrim
- **Sebastopol:** Curly feathered goose — striking show bird that needs dry roosts. — https://worldanimalrescuenetwork.org/wildlife-guides/goose/sebastopol
- **Roman Tufted:** Small white goose with a distinctive feather tuft on the crown. — https://worldanimalrescuenetwork.org/wildlife-guides/goose/roman-tufted
- **Brecon Buff:** Warm buff Welsh rare breed — hardy on pasture with a gentle temperament. — https://worldanimalrescuenetwork.org/wildlife-guides/goose/brecon-buff

## What WARN does
World Animal Rescue Network (WARN) does not run field projects specifically for wild geese, which range mainly outside the five countries where our partners work. This guide is part of WARN's free educational work, helping people understand and value the wildlife around them. The threats that affect vulnerable wetland geese, above all the loss and drainage of wetlands, also harm many of the animals WARN does help to protect.

If this guide helped you see geese a little differently, a small gift helps keep WARN's free wildlife education and animal-protection work going.

## Frequently asked questions: Goose
### What is the difference between a goose and a duck?
Geese and ducks are both in the family Anatidae, but geese are larger, with longer necks and heavier bodies. Geese are dedicated grazers that spend much of their time feeding on grass and crops on land, while many ducks feed more in water. In geese, both sexes usually look alike, unlike the often brightly coloured drakes among ducks.

### What is a male goose, a female goose and a baby goose called?
A male goose is called a gander, an adult female is simply called a goose, and a young goose is a gosling. Collectively the word geese is the plural. Goslings are covered in down and can walk, swim and feed themselves within a day or so of hatching, staying close to both parents, who help guard the brood until it can fly.

### Why do geese fly in a V-shape?
Flying in a V, or skein, saves energy. Each beating wing throws off swirling air, and birds positioned behind and to the side ride the rising part of that wake, gaining extra lift. The formation also helps the flock communicate and keep one another in sight on long migrations. Geese share and rotate through the tiring lead position at the point of the V.

### What do geese eat?
Geese are mainly herbivores and graze on grasses, sedges, leaves, roots and aquatic plants, as well as agricultural grain such as wheat, corn and rice. They use the serrated edges of their bills to crop vegetation. Some also take small amounts of insects, molluscs and other invertebrates, particularly when feeding fast-growing goslings that need extra protein.

### Are geese dangerous or aggressive?
Geese are not generally dangerous to people, but they can be aggressive, especially during the nesting season when defending a mate, nest or goslings. A defensive goose may hiss, lower its head, flap its wings and chase or nip an intruder. Such encounters are usually about warning you off rather than causing real harm. Keeping a respectful distance from nesting birds avoids most conflict.

### Where do geese live?
Geese are found across much of the world, particularly in the Northern Hemisphere. Grey and white geese (genus Anser) breed widely across Europe and Asia, while black geese (genus Branta), including the Canada goose, are strongly associated with North America. Geese favour wetlands, lakes, rivers, estuaries, grasslands and farmland, and many now thrive in urban parks where food and safety are plentiful.

## Sources
- [Goose - Wikipedia](https://en.wikipedia.org/wiki/Goose)
- [Greylag goose - Wikipedia](https://en.wikipedia.org/wiki/Greylag_goose)
- [Canada goose - Wikipedia](https://en.wikipedia.org/wiki/Canada_goose)
- [Goose - Encyclopaedia Britannica](https://www.britannica.com/animal/goose)
- [IUCN Red List](https://www.iucnredlist.org/)
- [CITES](https://cites.org/)

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Full guide: https://worldanimalrescuenetwork.org/wildlife-guides/goose