How to identify the Eastern Whip-poor-will

To correctly identify the Eastern Whip-poor-will (Antrostomus vociferus), 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

22-27 cm (8.7-10.6 in)

Wingspan

45-50 cm (17.7-19.7 in)

Weight

43-63 g (1.5-2.2 oz)

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   Cryptic, mottled plumage of grays, browns, blacks, and whites, resembling dead leaves or tree bark. The upperparts are streaked with black, and the underparts are barred. Males typically have prominent white patches on the outer tail feathers and a white throat band. Females have buffy or duller throat bands and smaller, buffy tail patches.

2. 2

   Beak shape

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

   Small, short, and flattened beak with a very wide gape, fringed with rictal bristles, adapted for catching insects in flight. Color is dark, often blackish.

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Large, dark brown eyes, adapted for nocturnal vision.

4. 4

   Leg color

   Leg and foot color.

   Dark brown to blackish, very short legs, adapted for perching horizontally rather than walking.

5. 5

   Distinguishing features

   Standout features that separate this species.

   Large head, short neck, and long wings. The rictal bristles around the mouth are prominent. The overall shape is somewhat flattened when perched. The white tail patches and white throat band (in males) are key field marks.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juveniles resemble adult females but are generally paler, with less distinct markings and a more buffy overall tone. Their plumage is softer and less defined.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   No significant seasonal plumage changes; their cryptic coloration remains consistent year-round, providing camouflage.

8. 8

   Sexual dimorphism

   How males and females differ.

   Males have prominent white patches on the outer three pairs of tail feathers and a clean white band across the throat. Females have buffy or duller, smaller patches on the outer tail feathers and a buffy or brownish throat band.

Key field marks

• Vocalization. The most reliable identification feature is its unmistakable, repetitive 'WHIP-poor-WILL' call, especially at dusk, dawn, or on moonlit nights. Listen for the three distinct syllables with the emphasis on the first and last.
• Plumage and Camouflage. Look for its superb camouflage, which makes it blend perfectly with leaf litter or tree bark. The mottled browns, grays, and blacks are designed for concealment. If you spot a bird that looks like a 'lump' on the ground or a horizontal branch, it might be a Whip-poor-will.
• White Tail Patches (Male). In males, look for prominent white patches on the outer three pairs of tail feathers, visible when the tail is fanned or in flight. Females have buffy, less distinct patches.
• White Throat Band (Male). Males display a clean white band across the throat, contrasting with the darker plumage. Females have a buffy or brownish throat band.
• Large Eyes and Rictal Bristles. If seen up close, note the large, dark eyes and the prominent rictal bristles (stiff feathers) around its wide mouth, which aid in insect capture.
• Nocturnal Activity. Remember that this bird is strictly nocturnal and crepuscular. You are most likely to hear it or see it briefly at dawn or dusk, or if flushed from its daytime roost.

Explore the Eastern Whip-poor-will