How to identify the Greylag Goose

To correctly identify the Greylag Goose (Anser anser), check each of these features. Birds can be tricky: habit, habitat, and call often confirm a sighting that a single photo cannot.

Size at a glance

Length

74-91 cm (29-36 in)

Wingspan

147-182 cm (58-72 in)

Weight

2.5-4.1 kg (5.5-9.0 lbs), males typically larger than females

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   Overall grey-brown plumage, paler on the belly, with a darker head and neck. The back and flanks have distinct pale fringes to the feathers, giving a barred appearance. The rump and undertail coverts are white. The primary and secondary flight feathers are dark, contrasting with the paler grey forewing.

2. 2

   Beak shape

   Shape and color of the bill: a key field mark.

   Large, conical bill, typically orange or pinkish-orange, with a pale nail at the tip. The exact shade can vary geographically and individually.

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Dark brown

4. 4

   Leg color

   Leg and foot color.

   Pink or pinkish-orange, with webbed feet.

5. 5

   Distinguishing features

   Standout features that separate this species.

   Large size, grey plumage with pale feather fringes, bright orange or pinkish-orange bill, and pink legs. The pale grey forewing is a key identification feature in flight.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juveniles are similar to adults but have duller plumage, less distinct barring on the flanks, and often a duller, more yellowish-pink bill and legs. Their overall appearance is less 'clean' than adults.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   No significant seasonal plumage changes. Plumage remains consistent year-round, though wear and tear can make feathers appear duller before molting.

8. 8

   Sexual dimorphism

   How males and females differ.

   Males (ganders) are generally slightly larger and heavier than females (geese), but plumage is identical. During breeding season, ganders may appear more aggressive.

Key field marks

• Size and Shape. Look for a large, bulky goose with a thick neck and a relatively large head. It's one of the largest 'grey geese'.
• Bill Color. The most reliable field mark is the bill, which is entirely orange or pinkish-orange (never black with a band, or with a white blaze). The exact shade can vary.
• Leg Color. The legs and feet are pink or pinkish-orange, matching the bill color.
• Plumage Details. Observe the overall grey-brown body with distinct pale fringes on the back and flank feathers, giving a 'scaly' or barred appearance. The white rump and undertail coverts are also visible.
• Flight Pattern (Forewing). In flight, look for the distinctive pale grey forewing, which contrasts with the darker primary and secondary flight feathers. This is a key feature to separate it from other grey geese.
• Vocalizations. Listen for the characteristic loud, resonant 'honk-honk-honk' calls, very similar to a domestic goose.

Explore the Greylag Goose