Black-Crowned Night Heron: A Stocky Wading Bird
Black-Crowned
Night Heron
Nycticorax nycticorax
Herons
-
Habitat
Marshes -
Food
Fish -
House
Tree -
Conservation
Low
Key Takeaway
The most expansive geographic range of any heron species in the world, this medium-sized wading bird can be found in freshwater and saltwater marshes, swamps, ponds, and rivers throughout Africa, Asia, Europe, North and South America, as well as the Falkland Islands.
Where are Great Egrets found?
Spotting a Black-Crowned Night Heron can happen across most continents except for Antarctica and Australia. Here is what sets this species apart:
Adult: Glossy black crown and back with a pale gray to white underbelly and gray wings, dark red eyes, and a thick black bill. During breeding season, they have two or three long white plumes extending from the back of the head.
Juveniles: Appear brown with heavy spotted or streaked buff and white colored feathers. A juvenile Black-Crowned Night Heron’s eyes are yellow-to-orange, and it has a yellowish-black bill.
Body: Unlike most long-necked, slender herons, the Black-Crowned Night Heron is short-legged, compact, and stocky.
Are there similar species or look-alikes to the Black-Crowned Night Heron?
Wetlands are home to several herons and wading birds, but a few field marks will help you distinguish the Black-Crowned Night Heron:
The Key Differences To Look For
Yellow-Crowned Night Heron: Similar, almost identical, stocky, short-necked silhouettes. The adults can easily be confused at a distance. Look for a yellowish-white crown, black face, and distinctive white cheek. Yellow-Crowned Night Herons also have a solid grey body.
Green Heron: Notably smaller, this heron is similar in its hunched, compact posture when foraging. The Green Heron has a dark green cap and back and a rich chestnut colored neck. It also has yellow-to-orange legs with a black beak.
American Bittern: These birds can look like juvenile Black-Crowned Night Herons. It shares a similar brown, streaked, camouflaged pattern. American Bitterns do not have white spots on their wings.
Least Bittern: The Least Bittern is much smaller than the Black-Crowned Night Heron. The warm buffy-ness and light streaking may resemble a juvenile night heron.
Where are Black-Crowned Night Herons found?
Black-Crowned Night Herons are the most widespread heron species on the planet. Look for them in:
North, Central, and South America
Europe, Africa, and Asia
Freshwater Marshes, Swamps, Rivers, Lakes, and Ponds
Saltwater and Brackish Mangrove swamps, coastal lagoons, salt marshes, estuaries, and tidal mudflats.
You’ll also find them in urban environments since they roost in groups during the day. They are protected by the numbers in parks, zoos, and at golf courses.
How do Black-Crowned Night Herons hunt and forage?
Watch a Black-Crowned Night Heron hunt, and you will see the art of the stand-and-wait ambush. These birds:
Stand motionless on the edge of the water from dusk to dawn (overnight). Once prey swims or crawls within range, they strike at lightning speed.
Slow Wading and bill-vibrating, they will occasionally wade through shallow water or mudflats to flush out prey that’s hiding. They vibrate their bills or flick their tongues rapidly in the water to lure curious fish closer.
The night advantage: during the night, fish and frogs migrate closer to the surface or banks.
Their diets are opportunistic. They are aggressive carnivores and swallow almost everything they catch whole, relying on fish, frogs, crayfish, bugs, lizards, and small rodents.
What are the nesting and breeding habits of Black-Crowned Night Herons?
Black-Crowned Night Herons, like other herons such as Great Egrets and Snowy Egrets, are social nesters, gathering in colonies—often with other herons and waterbirds. Here is what you will find during breeding season:
Nests: Bonded pairs work together to efficiently construct their nests. Like other birds, the male gathers materials (sticks, twigs, and reeds). After he drops them off, the female engineers the platform-style nest by weaving materials together.
Courtship: Males walk around hunched over, snapping their bills together and stretching their necks forward. They will move their heads up and down, emitting soft cooing or buzzing noises while rhythmically picking their feet up. During courtship, the adults’ legs turn from the normal yellow-green to bright pink or red, and they grow striking long white feathers on the back of their heads.
Eggs: They have three to five pale greenish-blue eggs.
Incubation: Both parents share duties for about 21–26 days.
Chick care: Both parents feed the chicks, which are highly sensitive to disturbance until they fledge.
What is the migration and range of the Black-Crowned Night Heron?
Black-Crowned Night Herons are both resident and migratory, depending on where you find them:
Northern Populations: Migrate in September and October in the fall and March and April in the spring, primarily at night, depending on water freezing.
Southern Birds: May remain year-round.
Routes: They will follow food sources such as the coasts and the Mississippi River, ending up on the Gulf Coast, Mexico, the Caribbean, and Central America during the winter. During the warmer months, the migratory ones will disperse, following smaller rivers to lakes and marshes.
What types of noises do they make?
Distinct, harsh, and unmusical can describe the noises Black-Crowned Night Herons use:
Context: During their night flights, they will use quawk, wok, or woc to make contact with other Black-Crowned Night Herons.
“Night Raven”: The loud, sudden sound emitted by the Black-Crowned Night Heron can sound like a raven’s squawk.
Greeting Calls: “Woc-a-woc-a-woc”
Aggressive and Defensive: “Krawk” and raspy, harsh hisses.
Courtship: Cooing and low-pitched buzzing or sharp bill snapping.
Frequently Asked Questions
Why are they called “night herons”?
Night herons are called so because they are primarily nocturnal hunters, foraging for food in the dark.
What does the Black-Crowned Night Heron sound like?
The Black-Crowned Night Heron produces a variety of vocalizations, including harsh, croaking calls and soft, plaintive notes. Its distinctive call is often described as a “quawk” or “kraa” sound, which can be heard echoing through wetlands and marshes where the bird resides.
Are Black-Crowned Night Herons aggressive?
Black-crowned night herons are generally not considered aggressive. They are solitary or social birds that tend to be more cautious and elusive rather than confrontational.
Why do Black-Crowned Night Herons look like they have no necks?
Black-Crowned Night Herons have a unique physical appearance that can make them seem as though they have no necks. Their short, stocky bodies and long, slender legs give them a distinctive, compact silhouette. This design is well-suited to their hunting style, allowing them to blend seamlessly into their surroundings and strike with precision when capturing prey.
Why do Black-Crowned Night Herons have red eyes?
Black-crowned night herons have red eyes due to the presence of a high concentration of blood vessels in the iris, which helps them see better in low-light conditions.
