How to identify the Budgerigar

To correctly identify the Budgerigar (Melopsittacus undulatus (example for Budgerigar)), 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

18-20 cm (7-8 in)

Wingspan

28-30 cm (11-12 in)

Weight

25-40 g (0.9-1.4 oz)

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   Wild-type Budgerigars have a bright green abdomen and rump, with a yellow head and throat. The back of the head, nape, and wing coverts are yellow with fine, black, wavy barring. The primary flight feathers are dark blue-green, and the tail feathers are dark blue with yellow flashes on the outer rectrices. A small, iridescent blue patch (cheek patch) is present on each side of the face, and three small black spots adorn each side of the throat. Domesticated varieties exhibit a wide range of color mutations including blue, white, yellow, grey, violet, and various pied patterns.

2. 2

   Beak shape

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

   Small, hooked, and strong, adapted for cracking seeds. Color is typically olive-grey in wild birds, but can vary in captive mutations (e.g., pinkish-horn in some blues).

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Dark brown with a white iris in adults; juveniles have solid dark eyes.

4. 4

   Leg color

   Leg and foot color.

   Greyish-blue to greyish-pink, zygodactyl feet (two toes forward, two backward).

5. 5

   Distinguishing features

   Standout features that separate this species.

   The distinctive wavy black barring on the yellow upperparts, the small size, long tapered tail, and the characteristic flight pattern. The cere color is a key indicator of sex in adults.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juveniles have duller plumage, less distinct barring, and a shorter tail. Their eyes are solid dark brown without the white iris ring seen in adults. The cere is pinkish-purple in both sexes until they reach sexual maturity (around 3-4 months).

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   No significant seasonal plumage changes. The cere color in females can change with hormonal cycles, becoming darker and crustier during breeding readiness.

8. 8

   Sexual dimorphism

   How males and females differ.

   Adult males typically have a bright blue cere (the fleshy area above the beak), while adult females have a tan, brownish, or crusty cere, especially when in breeding condition. Non-breeding females may have a pale blue or whitish cere. Juveniles of both sexes have a pinkish-purple cere.

Key field marks

• Size and Shape. Small, slender parrot with a relatively long, pointed tail. The overall impression is of a compact, agile bird.
• Plumage Pattern. Look for the distinctive fine, wavy black barring on a yellow background on the head, nape, and upper back. The bright green underparts are also a key field mark for wild birds.
• Flight. Observe their flight – it's fast, direct, and often undulating, especially when flying in flocks. They are highly maneuverable.
• Vocalizations. Listen for their characteristic continuous chatter, chirps, and warbles. In large flocks, this can be quite noisy.
• Social Behavior. They are almost always seen in flocks, from small groups to thousands, especially around water sources. Solitary Budgerigars are rare in the wild.

Explore the Budgerigar