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Black-crowned Night Heron

From Opus

(Redirected from Black-crowned Night-Heron)
N. n. nycticorax, adultPhoto by Joelle-MarcelleBrenne, France, May 2015
N. n. nycticorax, adult
Photo by Joelle-Marcelle
Brenne, France, May 2015
Nycticorax nycticorax

Contents

[edit] Identification

N. n. hoactli, adultPhoto by GeneIllinois, USA, May 2004
N. n. hoactli, adult
Photo by Gene
Illinois, USA, May 2004

Length 51-70 cm (25 in), wingspan 100-112 cm, weight 520-800 g
A medium-small, rather stout heron, looking stocky and short-necked when at rest
Adult

  • Black crown, lores, and back
  • Narrow white forehead
  • Two slender white plumes on the rear of the head in the breeding season
  • Eye bright red
  • Bill black in breeding season, often with yellowish-grey base in rest of year
  • Rest of body white or pale grey below
  • Wings and tail dark grey
  • Short yellow legs, becoming bright pink to red during courtship in spring
N. n. falklandicus, adultPhoto by cranstallPebble Island, Falkland Islands, January 2015
N. n. falklandicus, adult
Photo by cranstall
Pebble Island, Falkland Islands, January 2015

First-year young birds

  • Dark brown above, paler brown below, with white to pale buffy-brown teardrop marks on all feather tips
  • Legs duller, often greenish- or greyish-yellow
  • Eye yellowish to orangey
  • Bill with yellowish-grey base

Second year subadult birds

  • Similar to adult, except dark grey-brown where adult is black, and breast streaked dark grey
  • Bill black or with yellowish-grey base

[edit] Variations

The subspecies differ mainly in breast darkness, with N. n. hoactli the palest, N. n. nycticorax intermediate, and N. n. obscurus and N. n. falklandicus the darkest, dusky grey below. Some authorities treat N. n. falklandicus as a synonym of N. n. obscurus[3]. Juvenile and second year plumages are not reported to differ between subspecies.

[edit] Similar species

N. n. hoactli, juvenilePhoto by bobsofpaCorkscrew Swamp Sanctuary, Florida, USA, February 2014
N. n. hoactli, juvenile
Photo by bobsofpa
Corkscrew Swamp Sanctuary, Florida, USA, February 2014

Adults are very distinctive, with few confusion possibilities. Rufous Night Heron overlaps locally in southeast Asia; it differs in being reddish-brown where Black-crowned is dark grey. In South America, the Boat-billed Heron has a similar plumage pattern, but is smaller and with an obviously large, swollen bill.

Juveniles are more easily confused with other brown herons; Botaurus bitterns are markedly larger, while juvenile Ixobrychus bitterns are smaller. Young Yellow-crowned Night Heron in the Americas is the most easily confused; it differs in being longer-legged, duller brown with smaller pale teardrop marks, and thicker-billed.

[edit] Distribution

Near cosmopolitan, throughout warmer areas of Europe, Africa, Asia, North, Central, and South America. Missing from Australasia, where it is replaced by the closely related Rufous Night Heron, and Antarctica.

[edit] Europe

N. n. nycticorax, 2nd yearPhoto by Cristian MihaiChitila, Ilfov, Romania, June 2013
N. n. nycticorax, 2nd year
Photo by Cristian Mihai
Chitila, Ilfov, Romania, June 2013

Patchy breeding range across southern and central Europe from Iberia to Greece and Turkey, and north to France, the Netherlands, and Russia. Its range is currently expanding slowly north following better protection, with the first modern breeding record in Britain in 2017.

It is a summer visitor to all its European range, with birds migrating to subsaharan Africa in winter. Overshooting spring migrants are regularly seen in Britain (>500 records), usually May-June, more rarely north to Iceland and the Faroes, Norway, Finland, and Estonia. Also recorded on the Azores, Madeira, and Cape Verde Islands.

There are also feral colonies in Belgium which are the descendants of released birds, and formerly also in Norfolk, England and around Edinburgh Zoo, Scotland (the latter were of the subspecies N. n. hoactli).

[edit] Asia

In Asia breeds from the Caspian east to China and Japan and south to India and Sri Lanka, Malaya, Borneo and Sumatra. Birds in central Asia are migratory, those in southern Asia are resident.

[edit] Africa & Middle East

N. n. nycticorax, adult in flightPhoto by mikemikHrase, Slovenia, August 2015
N. n. nycticorax, adult in flight
Photo by mikemik
Hrase, Slovenia, August 2015

Widespread in subsaharan Africa from Senegal to Somalia and south to the Cape but breeding records are widely scattered. Also small numbers in northwest Africa, the Nile Delta and parts of the Middle East.

[edit] Americas

Breeds in south-central and south-eastern Canada and over much of the USA except the mountains of the west. Also occurs in the West Indies and from Mexico south to Panama and over most of South America except the higher Andes and Amazonia. Also breeds in the Falkland Islands and Hawaii. Northern birds are migratory and winter in south-west and south-east USA.

[edit] Taxonomy

[edit] Subspecies

Four subspecies are recognised[1][2]:

  • N. n. nycticorax:
  • N. n. hoactli:
  • N. n. obscurus:
  • N. n. falklandicus:

[edit] Habitat

Wooded swamps, well-vegetated margins of lakes and rivers. On passage and in winter sometimes in more open habitats, including brackish lagoons and estuaries.

[edit] Behaviour

Usually crepuscular.

[edit] Diet

An opportunistic feeder, their very varied diet consists of fish, and shellfish, leeches, earthworms, insects, amphibians, reptiles, such as lizards and snakes, turtles, rodents, birds, and their eggs. They also eat plants, carrion and forage at landfill sites.

[edit] Breeding

It builds a platform of sticks placed in tree or cattails and nests colonially; more than a dozen nests may be in a single tree. Clutch usually consists of 3-5 greenish eggs.

[edit] Vocalisation


Listen in an external program

[edit] References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017, with updates to August 2017. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. Gill, F. and Donsker, D. (Eds). 2017. IOC World Bird Names (version 7.3). Available at http://www.worldbirdnames.org/.
  3. Del Hoyo, J, A Elliot, and J Sargatal, eds. 1992. Handbook of the Birds of the World. Volume 1: Ostrich to Ducks. Barcelona: Lynx Edicions. ISBN 978-8487334108
  4. Alvaro Jaramillo. 2003. Birds of Chile. Princeton Field Guides. ISBN 0-691-11740-3
  5. Handbook of the Birds of the World Alive (retrieved August 2015)
  6. surfbirds
  7. All About Birds
  8. Wikipedia

[edit] External Links


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