Nankeen Night Heron
Nycticorax caledonicus
棕夜鹭
Introduction
A heron species belonging to the genus Nycticorax and family Ardeidae. The species has a broad distribution across Australia, New Zealand, Papua New Guinea, the Philippines, the Solomon Islands, Java, New Caledonia, Palau, and the Caroline Islands. It occupies diverse habitats including forests, meadows, shores, reefs, marshes, grasslands, swamps, and areas near rivers and streams. The species is primarily nocturnal, roosting in dense vegetation during the day and foraging from dusk to dawn. It is characterized by its distinctive rich reddish-brown or cinnamon plumage. The population is stable and assessed as Least Concern by the IUCN.
Description
A medium-sized heron with males measuring 55-65 cm in length and females 55-60 cm. Body mass ranges from 810-1014 g with a wingspan of 95-105 cm. The species has rich chestnut or cinnamon upperparts and white underparts, with a gradual color blend on the neck and upper breast. It possesses a heavy black bill and a white face with cinnamon tint. Breeding adults have a grey-black crown and nape, often with two or three thin white plumes directed downward. The back, tail, and upper wings are rich rufous. The iris is straw yellow, sometimes orange-tinged during breeding. Legs and feet are creamy yellow, becoming bright pink during courtship. Juveniles differ significantly with black-brown streaked head and nape, heavily streaked brown neck, and lime-green to olive-grey legs.
Distribution & Habitat
Widespread across Australia, New Zealand, Papua New Guinea, the Philippines, the Solomon Islands, Java, New Caledonia, Palau, and the Caroline Islands. In Australia, it occurs in most states but is rare or absent in the west. The species inhabits grasslands, meadows, forests, lagoons, beaches, reefs, marshes, shores, wetlands, swamps, and areas near rivers and streams. It prefers habitats with emergent vegetation near permanent water. During the day, it roosts in dense cover of trees, bushes, and reeds. In urban areas, it favors cypress and pine trees. Some Australian populations are partially migratory, moving north during winter to Papua New Guinea, New Zealand, and Pacific islands including Christmas Island, Lord Howe Island, and Cocos-Keeling Island.
Behavior & Ecology
Diet consists primarily of aquatic creatures including freshwater invertebrates, crayfish, crabs, fish, sea turtle hatchlings, frogs, lizards, mice, and insects such as crickets, water beetles, ants, wasps, caterpillars, and dragonfly larvae. Crayfish is the dominant prey. Foraging occurs mainly at night and in the morning, typically by walking slowly in shallow water or plunging from perches in deeper water. During breeding, it also feeds during the day. Breeding occurs year-round with peak seasons varying by region: October to May in Australia, February to June in Java, and February to May in the Philippines. Nests are loosely constructed sticks, 20-30 cm in diameter, built in dense trees, marshes, swamps, caves, or under rock overhangs. It breeds in large mixed-species colonies. Eggs are pale green-blue, clutch size 2-5, and incubation lasts 21 days. Chicks fledge at 6-7 weeks. Vocalizations include a qu-arck call in departing males, higher qu-ook in females and juveniles, quock when disturbed, hoarse croaking quok in flight, and harsh croaks when feeding in groups. Chicks beg with kak-kak-kak calls.
Conservation
Assessed as Least Concern by the IUCN. The population is stable with a fluctuating but not declining trend. The species has a very large population size and an extremely large range with an estimated extent of occurrence of 31,600,000 km². One subspecies, the Bonin nankeen night heron (N. c. crassirostris), became extinct in the late 1800s. Currently, no conservation measures are in place as the species does not meet any vulnerability criteria.
Culture
The article contains no information on cultural significance or folklore.
Source: Wikipedia · CC BY-SA 3.0
Taxonomy
- Order
- Pelecaniformes
- Family
- Ardeidae
- Genus
- Nycticorax
- eBird Code
- runher1
Subspecies (6)
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Nycticorax caledonicus australasiae
Java, Lesser Sundas, New Guinea, and Australia (including Tasmania but not western deserts)
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Nycticorax caledonicus caledonicus
New Caledonia
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Nycticorax caledonicus crassirostris
formerly Bonin Islands; extinct since the late 1800s
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Nycticorax caledonicus mandibularis
Bismarck Archipelago and Solomon Islands
-
Nycticorax caledonicus manillensis
Philippines, eastern Borneo, and Sulawesi
-
Nycticorax caledonicus pelewensis
Palau and other Caroline islands
Data Sources
Species description from Wikipedia, licensed under CC BY-SA 3.0.
Taxonomy data from AviList 2025.