How to identify the Black-bellied Whistling-Duck

To correctly identify the Black-bellied Whistling-Duck (Dendrocygna autumnalis), 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

47-56 cm (18.5-22 in)

Wingspan

76-94 cm (30-37 in)

Weight

650-1000 g (1.4-2.2 lbs)

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   Adults have a bright reddish-pink bill, a chestnut-brown neck and head, a gray face, and a black belly. The back is chestnut, and the wings are mostly black with a prominent white patch on the secondary flight feathers, visible in flight and at rest. The legs are long and pinkish-red. Juveniles are duller overall, with a grayish bill, mottled brown belly, and less distinct white wing patch.

2. 2

   Beak shape

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

   Relatively long, stout, and bright reddish-pink in adults, grayish in juveniles.

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Dark brown.

4. 4

   Leg color

   Leg and foot color.

   Pinkish-red in adults, duller in juveniles.

5. 5

   Distinguishing features

   Standout features that separate this species.

   Bright pink bill, black belly, white wing patch (especially prominent in flight), long pink legs, and an upright, goose-like posture. They often perch in trees.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juveniles have a duller, grayish bill, a mottled brown belly (rather than solid black), and a less vibrant chestnut on the neck and back. The white wing patch is present but may be less distinct.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   No significant seasonal plumage changes.

8. 8

   Sexual dimorphism

   How males and females differ.

   None; males and females are virtually identical in plumage and size.

Key field marks

• Bill Color. Look for the bright reddish-pink bill in adults. This is a key distinguishing feature.
• Belly Color. Observe the solid black belly, contrasting with the chestnut back and neck.
• Wing Pattern in Flight. Note the large, conspicuous white patch on the trailing edge of the wing, especially visible when the bird is in flight.
• Legs and Posture. Their long, pinkish-red legs and upright, goose-like stance are unique among most ducks. They often perch in trees.
• Vocalization. Listen for their distinctive, clear whistling 'pee-WHEW' call.

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