How to identify the White-browed Sparrow-Weaver

To correctly identify the White-browed Sparrow-Weaver (Plocepasser mahali), 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

17-19 cm

Wingspan

28-32 cm

Weight

40-60 g

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   Adults have a distinctive white supercilium (eyebrow) that extends from the bill to behind the eye, contrasting with a dark brown crown and ear coverts. The back and wings are brown, often with paler feather edges giving a slightly scaled appearance. The rump is white, and the tail is dark brown with white outer tail feathers, particularly noticeable in flight. Underparts are off-white to pale grey, sometimes with a buff wash on the flanks. The throat is typically white, and there is often a dark malar stripe.

2. 2

   Beak shape

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

   Conical, stout, and relatively short, adapted for cracking seeds and manipulating insects. Color is typically blackish or dark horn-colored.

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Dark brown.

4. 4

   Leg color

   Leg and foot color.

   Dark grey to blackish.

5. 5

   Distinguishing features

   Standout features that separate this species.

   The prominent white supercilium, white rump, and white outer tail feathers are key identification features. Its social behavior and large, messy communal nests are also highly characteristic.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juveniles resemble adults but have a duller plumage overall. The white supercilium may be less distinct or tinged buff, and the underparts may be more buffish. The bill can be paler, sometimes yellowish at the base.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   No significant seasonal plumage changes. Plumage may appear slightly worn or faded outside of the breeding season due to feather abrasion.

8. 8

   Sexual dimorphism

   How males and females differ.

   Males and females are generally monomorphic in plumage, appearing very similar. There might be slight size differences, with males being marginally larger, but this is not reliably discernible in the field.

Key field marks

• White Supercilium. Look for the prominent, bright white stripe above the eye, contrasting with the dark crown. This is the most distinctive field mark.
• White Rump and Outer Tail Feathers. Observe the bird in flight or when it fans its tail; the white rump and white outer tail feathers are very conspicuous and diagnostic.
• Communal Nests. Scan acacia or thorny trees for large, messy, globular grass nests, often with multiple entrance holes. The presence of such nests strongly indicates the species.
• Social Behavior. They are almost always seen in small, active groups, foraging together and vocalizing frequently. Solitary individuals are rare.
• Vocalizations. Listen for their characteristic chattering and whistling calls and songs, often given in chorus by the group.

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