Night heron
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 Black-crowned Night Heron, Nycticorax nycticorax
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The night herons are medium-sized herons in the genera Nycticorax and Gorsachius. The genus name Nycticorax derives from the Greek for “night raven” and refers to the largely nocturnal feeding habits of this group of birds, and the croaking crow-like call of the best known species, the Black-crowned Night Heron. These herons are migratory outside the tropical parts of their ranges.
In Europe, Night Heron is often used to refer to the Black-crowned Night Heron, since it is the only member of the genus in that continent.
Adults are short-necked and stout herons; they typically have a dark crown and back with the remainder of the body white or grey, and short legs. Young birds are brown, flecked with white and grey, and are quite similar in the extant Nycticorax species. At least some of the extinct Mascarenes taxa appear to have retained this juvenile plumage in adult birds.
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. 3-8 eggs are laid.
Night herons 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.
There are seven extant species. The genus Nycticorax has suffered more than any other ciconiiform genus from extinction, mainly because of their capability to colonize small, predator-free oceanic islands, and a tendency to evolve towards flightlessness.
[edit] Species
- Yellow-crowned Night Heron, Nycticorax violaceus or Nyctanassa violacea
- Bermuda Night Neron, Nycticorax carcinocatactes or Nyctanassa carcinocatactes (extinct)
- Black-crowned Night Heron, Nycticorax nycticorax
- White-backed Night Heron, Nycticorax leuconotus or Gorsachius leuconotus
- Rodrigues Night Heron, Nycticorax megacephalus (extinct)
- Réunion Night Heron, Nycticorax duboisi (extinct)
- Mauritius Night Heron, Nycticorax mauritianus (extinct)
- Ascension Night Heron, Nycticorax olsoni (extinct)
- Niue Night Heron, Nycticorax kalavikai (prehistoric)
- ‘Eua Night Heron, Nycticorax sp. (prehistoric)
- Lifuka Night Heron, Nycticorax sp. (prehistoric) - may be same as ‘Eua species
- Nankeen Night Heron or Rufous Night Heron, Gorsachius caledonicus or Nycticorax caledonicus
- Bonin Nankeen Night Heron, Nycticorax caledonicus crassirostris (extinct, c.1890)
- White-eared Night Heron, Gorsachius magnificus
- Japanese Night Heron, Gorsachius goisagi
- Malayan Night Heron, Gorsachius melanolophus
In addition, the following taxa are known from fossil bones:
