Black-crowned Night-HeronNycticorax nycticorax

adult (breeding)
Marvin R. Hyett, M.D./VIREO
juvenile
Arthur Morris/VIREO
adult
James M. Wedge/VIREO
adult
Doug Wechsler/VIREO
adult
Arthur Morris/VIREO
adult
Tom Vezo/VIREO
Black-crowned Night-Heron
Black-crowned Night-Heron

Description

23-28" (58-71 cm). W. 3'8" (1.1 m). A medium-sized, stocky, rather short-necked heron with black crown and back, gray wings, and white underparts. Bill short and black, legs pinkish or yellowish. In breeding season it has 2 or more long white plumes on back of head. Young birds are dull gray-brown lightly spotted with white. Young Yellow-crowned Night-Herons are grayer, with stouter bills and longer legs.

Voice

Loud, barking kwok! or quawk! often heard at night or at dusk. Utters a variety of croaks, barks, and other harsh calls in nesting colonies.

Listen

alarm calls at rookery
wok flight calls
alarm calls of immature taking flight
rookery sounds

Habitat

Marshes, swamps, and wooded streams.

Range

Breeds throughout United States (except Rocky Mountain region), from Washington, Saskatchewan, Minnesota, and New Brunswick to southern South America. Winters in southern half of United States. Also occurs in much of Old World.

Discussion

As its name implies, this noisy bird is largely nocturnal, beginning to forage at dusk, when other herons are on their way to roosts. Night-herons are less likely to nest in mixed colonies than other herons; when they do, they often keep to themselves in a separate corner. These birds are sluggish hunters, standing quietly for long periods of time waiting for a frog or fish to pass by. They also plunder the nests of other herons and make regular nighttime visits to colonies of terns or Franklin's Gulls, where they sometimes take large numbers of chicks. Night-herons also stalk in grasslands in places where meadow voles are abundant, preying on these small rodents.

Nesting

3-5 pale blue-green eggs in a shallow saucer of sticks or reeds in a thicket or reedbed; occasionally in tall trees. Nests in colonies, sometimes with other species of herons.

Similar Species

adult

Yellow-crowned Night-Heron

22-27" (56-69 cm). W. 3'8" (1.1 m). Medium-sized heron. Adult slate-gray with black head, white cheeks, yellowish crown and plumes, black bill, and yellow or orange legs.

American Bittern

23-34" (58-86 cm). A secretive, medium-sized, streaked brown heron. Outer wing appears blackish brown in flight, contrasting with lighter brown of inner wing and body.

Vireo

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