White-crested tiger heron | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Pelecaniformes |
Family: | Ardeidae |
Subfamily: | Tigriornithinae |
Genus: | Tigriornis Sharpe, 1895 |
Species: | T. leucolopha |
Binomial name | |
Tigriornis leucolopha (Jardine, 1846) | |
Synonyms | |
Tigriornis leucolophus (Jardine, 1846) |
The white-crested tiger heron (Tigriornis leucolopha), also known as the white-crested bittern, is a species of heron in the monotypic genus Tigriornis and a member of the family Ardeidae. It is widely distributed across the African tropical rainforest, often occurring near small streams and marshes. [1] This heron exhibits unobtrusive black, brown and buff coloration and possesses a white crest, which may be viewed when erected. [2] Not much is known about this heron or its behaviors, although it is known to feed on the small fish, crustaceans, frogs, snakes and insects which inhabit rivers or river shores. [2] Despite its elusiveness, it is found over a broad range and has been assessed by the International Union for Conservation of Nature as "Least Concern". Due to threats such as habitat destruction and poaching for use in medicine, its population has been decreasing over time. [1]
The white-crested tiger heron possesses a distinct appearance, including a slender elongated body, standing at around 66 to 80 centimeters tall (25–31 in). [2] Its plumage is relatively dull, and consists of brown, buff and rufous plumage, along with black barring. The exception to its dull plumage lies in its brilliant white crest, although not much is known about its uses. The nape along with the sides of its head and neck are light rufous with black barring, while the mantle, scapulars and rump possess rufous, buff and brown coloration, with bold black bars. [3] Females possess a more dull coloration, including narrow buff barring and a pink cinnamon coloration on the underside. [4] The legs, along with the eye and part of the bill are yellow with black highlights. [3] Chicks originally possess yellow down, which turns to white before molting. [2] [5]
This bird was first described in 1846 by Scottish ornithologist and naturalist Sir William Jardine, who classified it as "Tigrornis leucolophus." [6] [7] However, it was only fully taxonomized around 50 years later in 1895, by English zoologist and ornithologist Richard Bowdler Sharpe. Sharpe designated Tigrornis as a monotypic genus, rather than categorizing the heron into another genus such as Tigrosoma, which contains other birds also described as 'tiger herons.' [6] [8] Sharpe also renamed the heron "Tigrornis leucolopha," as opposed to "leucolophus." This classification stands to this day.
This heron ranges throughout a large expanse of western and central Africa, spanning across the African tropical rainforest. [9] It is not migratory, and spends nearly all of its time along bodies of streams, marshes and swampy areas within the forest. [10] However, incidents of vagrancy have been reported in the country of Mauritania. [1]
Due to its elusiveness, not much is known regarding this heron's behavioral aspects. However, this bird has been seen regularly foraging near water in dense lowland forests and mangrove ecosystems. [11] It is a carnivorous solitary feeder, primarily foraging for a wide range of fish, crabs, crayfish, frogs, snakes, spiders and insects. [11] This heron is primarily nocturnal and is most active at dawn and dusk. [3] Its booming call is similar to most large bitterns, and it may take the form of a single- or double-noted sound. [11] When disturbed, the heron exhibits a bittern posture, pointing its bill up while stretching out its wings. [2] This heron is largely sedentary, despite certain reports of migratory movements or vagrancy. [4]
Very little is known of this bird's breeding habits, although it is speculated that these birds nest during the rainy season. [2] Egg laying dates vary greatly, and have been documented as September–October in Sierra Leone, October in Liberia, May in Cameroon and January in Gabon. [5] [12] [13] Eggs have been observed during separate periods from September–October to December–January. [14] The periods in which hatchlings have been observed also varies greatly. Hatchlings have been documented during the periods of October, December–January and May–June. [14] Only three nests have been described to date, all featuring fragile platforms of twigs 2 to 6 meters (6 to 19 ft) above water. [10] Reports of eggs have described their coloration as beige-yellow with purple, blue-gray and reddish-brown markings. [13] These eggs have been reported as 55 x 45 millimeters (2.2 x 1.8 in) in size, and the incubation period has been documented at around 29 days long. [10]
Due to the elusiveness of this bird, little is known regarding its conservation status. Despite this, it has been assessed repeatedly by the IUCN Red List, and was given the conservation status of Least Concern in 2005. [1] However, the heron is only classified as Least Concern due to the fact that it does not meet the thresholds for "Vulnerable." This is solely due to the range size, although population dynamics may also be a contributing factor. As of 2018, the population has been estimated at around 25,000 to 100,000 individuals. [1] The species has also been assessed as a declining population do to habitat loss, although this is subject to further confirmation. Habitat loss functions as the most significant threat to this species, along with poaching for use in medicine. [10]
The American bittern is a species of wading bird in the heron family. It has a Nearctic distribution, breeding in Canada and the northern and central parts of the United States, and wintering in the U.S. Gulf Coast states, all of Florida into the Everglades, the Caribbean islands and parts of Central America.
The Eurasian bittern or great bittern is a wading bird in the bittern subfamily (Botaurinae) of the heron family Ardeidae. There are two subspecies, the northern race breeding in parts of Europe and across the Palearctic, as well as on the northern coast of Africa, while the southern race is endemic to parts of southern Africa. It is a secretive bird, seldom seen in the open as it prefers to skulk in reed beds and thick vegetation near water bodies. Its presence is apparent in the spring, when the booming call of the male during the breeding season can be heard. It feeds on fish, small mammals, fledgling birds, amphibians, crustaceans and insects.
Herons are long-legged, long-necked, freshwater and coastal birds in the family Ardeidae, with 74 recognised species, some of which are referred to as egrets or bitterns rather than herons. Members of the genus Botaurus are referred to as bitterns, and, together with the zigzag heron, or zigzag bittern, in the monotypic genus Zebrilus, form a monophyletic group within the Ardeidae. Egrets do not form a biologically distinct group from herons, and tend to be named differently because they are mainly white or have decorative plumes in breeding plumage. Herons, by evolutionary adaptation, have long beaks.
The cinnamon bittern or chestnut bittern is a small Old World bittern, breeding in tropical and subtropical Asia from India east to China and Indonesia. It is mainly resident, but some northern birds migrate short distances. This species was formerly placed in the genus Ixobrychus.
The yellow bittern is a small bittern. It is of Old World origins, breeding in the northern Indian Subcontinent, east to the Russian Far East, Japan and Indonesia. It is mainly resident, but some northern birds migrate short distances. It has been recorded as a vagrant in Alaska and there is a single sighting in Great Britain, from Radipole Lake, Dorset on November 23, 1962 – however, the British Ornithologists' Union has always considered this occurrence to be of uncertain provenance and currently it is not accepted onto the official British List. This species was formerly placed in the genus Ixobrychus.
The black bittern is a bittern of Old World origin, breeding in tropical Asia from Pakistan, India, Bangladesh and Sri Lanka east to China, Indonesia, and Australia. It is mainly resident, but some northern birds migrate short distances. This species was formerly placed in the genus Ixobrychus.
The rufescent tiger heron is a species of heron in the family Ardeidae. It is found in wetlands from Central America through much of South America.
The zigzag heron is a species of heron in the family Ardeidae, also including egrets and bitterns. It is in the monotypic genus Zebrilus. It is found in Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela. Its natural habitat is subtropical or tropical swamps.
The pallid cuckoo is a species of cuckoo in the family Cuculidae. It is the only species placed in the genus Heteroscenes. It is found in Australia, with some migration to the islands of Timor and Papua New Guinea. It is between 28 and 33 cm in size, with distinctive markings such as a dark bill, a dark eye with a gold eye-ring and olive grey feet which differentiate it from other cuckoos. The pallid cuckoo is similar in appearance to the oriental cuckoo, with barred immature pallid cuckoos being often mistaken for oriental cuckoos.