Black-crowned Night Heron
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| Nycticorax nycticorax Linnaeus, 1758 |
The Black-crowned Night Heron, (Nycticorax nycticorax), commonly abbreviated to just Night Heron in Eurasia, is a medium-sized heron found throughout a large part of the world, except in the coldest regions and Australasia (where replaced by the closely related Rufous Night Heron, with which it has hybrdized in the area of contact).
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[edit] Description
Adults are approximately 64 cm long and weigh 800 g. They have a black crown and back with the remainder of the body white or grey, red eyes, and short yellow legs. Young birds are brown, flecked with white and grey. These are short-necked and stout herons.
[edit] Distribution
The breeding habitat is fresh and salt-water wetlands throughout much of the world. The subspecies N. n. hoactli breeds in North and South America from Canada as far south as northern Argentina and Chile, N. n. obscurus in southernmost South America, N. n. falklandicus in the Falkland Islands, and the nominate race N. n. nycticorax in Europe, Asia and Africa. Black-crowned Night Herons nest in colonies on platforms of sticks in a group of trees, or on the ground in protected locations such as islands or reedbeds. Three to eight eggs are laid.
This heron is migratory in the northermost part of its range, but otherwise resident (even in the cold Patagonia). The North American population winters in Mexico, the southern United States, Central America, and the West Indies, and the Old World birds winter in tropical Africa and southern Asia.
[edit] Behaviour
These birds stand still at the water's edge and wait to ambush prey, mainly at night. They primarily eat small fish, crustaceans, frogs, aquatic insects, and small mammals. During the day they rest in trees or bushes. N. n. hoactli is more gregarious outside the breeding season than the nominate race.
They are often found nesting or roosting within cities in avenue trees on busy roads.
[edit] Etymology
The scientific name, Nycticorax, means "night raven", and refers to this species' nocturnal habits and harsh crow-like call.
In the Falkland Islands, they are known as "quarks" which is an onomatopoeic term.
[edit] References
- BirdLife International (2008). Nycticorax nycticorax. 2008 IUCN Red List of Threatened Species. IUCN 2008. Retrieved on 4 February 2009. Database entry includes justification for why this species is of least concern.
- Black-crowned Night Heron on Animal Diversity Web
- A guide to the birds of Costa Rica by Stiles and Skutch ISBN 0-8014-9600-4
- Herons and Egrets of the World by James Hancock ISBN 0-12-322725-9
- The Sibley Guide to Birds by David Allen Sibley ISBN 0-679-45122-6
[edit] External links
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Wikimedia Commons has media related to: Nycticorax nycticorax |
- Image of juvenile
- Cornell Lab of Ornithology - Black-crowned Night-Heron Information
- USGS Patuxent Bird Identification InfoCenter - Black-crowned Night-Heron
- South Dakota Birds and Birding - Black-crowned Night-Heron Information and Photos
- eNature.com - Black-crowned Night-Heron
- Field Guide on Flickr
[edit] Gallery
 Black-crowned Night Heron in Saint-Eustache, Quebec, Canada. |
 Black-crowned Night Heron in Saint-Eustache, Quebec, Canada. |
 Black-crowned Night Heron in Saint-Eustache, Quebec, Canada. |
 Black-crowned Night Heron in Kolkata, West Bengal, India. |
_I_IMG_7370.jpg) Immature in flight, Kolkata, West Bengal, India. |
 Immature acquiring adult plumage, Kolkata, West Bengal, India. |
 Close-up of juvenile, Lake Merritt, Oakland, California, USA. |
 Black-crowned Night Heron in Portland, Maine, USA, harbor. |
