How to identify the Horned Screamer

To correctly identify the Horned Screamer (Anhima cornuta), 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

83-95 cm (33-37 in)

Wingspan

170-180 cm (67-71 in)

Weight

2.0-3.1 kg (4.4-6.8 lbs)

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   Predominantly dark grey to blackish plumage on the upperparts, with a white belly and underwing coverts. The neck is black with a white collar. The head is small relative to the body, featuring a unique, unfeathered, chitinous horn that can grow up to 15 cm (6 in) long, curving forward. Two sharp, bony spurs are present on the bend of each wing.

2. 2

   Beak shape

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

   Small, chicken-like bill, greyish in color.

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Reddish-brown.

4. 4

   Leg color

   Leg and foot color.

   Strong, pinkish-red legs and large, partially webbed feet.

5. 5

   Distinguishing features

   Standout features that separate this species.

   The most distinctive feature is the long, slender, horn-like projection on its forehead. The large size, dark body, white belly, and prominent wing spurs are also key identifiers. Its loud, far-carrying calls are also highly characteristic.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juveniles resemble adults but have duller plumage, often with some brownish mottling, and a shorter, less developed horn. The wing spurs are also less prominent.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   No significant seasonal plumage changes are observed.

8. 8

   Sexual dimorphism

   How males and females differ.

   Males and females are monomorphic in plumage and size, making them difficult to distinguish visually in the field without behavioral cues.

Key field marks

• Head Horn. Look for the unmistakable, slender, forward-curving horn on the forehead. This is the most definitive field mark.
• Plumage Pattern. Observe the dark grey to blackish upperparts contrasting sharply with the white belly and underwing coverts. Note the black neck with a distinct white collar.
• Size and Shape. Identify its large, goose-like body, relatively small head, and long, strong pinkish-red legs.
• Wing Spurs. If visible, note the two sharp, bony spurs on the bend of each wing, used for defense.
• Vocalizations. Listen for its loud, trumpet-like 'screams' or 'yells,' often given in duets, which carry over long distances.
• Habitat. Look for it in open, shallow freshwater wetlands, marshes, and lagoons.

Explore the Horned Screamer