How to identify the Black-crowned Night Heron

To correctly identify the Black-crowned Night Heron (Nycticorax nycticorax), 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

58-66 cm (23-26 in)

Wingspan

99-112 cm (39-44 in)

Weight

500-1000 g (1.1-2.2 lbs)

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   Adults have a black cap extending to the nape, a black back, and pale grey wings and tail. The underparts are white. Two or three long, white, filamentous plumes extend from the back of the head during the breeding season. Juveniles are mottled brown with streaky underparts and pale spots on the back and wings.

2. 2

   Beak shape

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

   Stout, conical, and sharply pointed. Black in adults, yellowish-green to blackish in juveniles.

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Bright red in adults, dull yellow to orange in juveniles.

4. 4

   Leg color

   Leg and foot color.

   Yellowish-green, turning bright pinkish-red during the breeding season in adults. Dull yellow to greenish in juveniles.

5. 5

   Distinguishing features

   Standout features that separate this species.

   Stocky build, short neck, and nocturnal habits. Adults have a distinctive black cap and back, grey wings, and red eyes. Juveniles are heavily streaked brown.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juveniles are entirely different from adults. They are mottled brown overall, with heavy brown streaking on the neck and underparts, and pale, yellowish-white spots on the back and wing coverts. Their eyes are dull yellow to orange, and legs are dull yellow-green. They gradually acquire adult plumage over 2-3 years.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   Adults show brighter leg coloration (pinkish-red) and more prominent head plumes during the breeding season. Otherwise, plumage is largely consistent year-round.

8. 8

   Sexual dimorphism

   How males and females differ.

   Minimal; sexes are generally similar in plumage and size, though males may be slightly larger.

Key field marks

• Overall Shape and Size. Look for a stocky, medium-sized heron with a relatively short neck and legs, often appearing hunched when perched.
• Adult Plumage. Distinctive black cap and back, contrasting with pale grey wings and white underparts. Red eyes are a key field mark.
• Juvenile Plumage. Heavily mottled brown with pale spots on the back and wings, and streaky underparts. Dull yellow eyes and legs.
• Behavior. Observe its activity patterns; if it's active at dusk or night, it's a strong indicator. Look for it standing motionless at the water's edge or flying with retracted neck.
• Call. Listen for the characteristic loud, harsh 'quok' call, especially at twilight or during nocturnal flight.

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