Humblot's heron | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Pelecaniformes |
Family: | Ardeidae |
Genus: | Ardea |
Species: | A. humbloti |
Binomial name | |
Ardea humbloti Milne-Edwards & Grandidier, 1885 | |
Humblot's heron (Ardea humbloti), also known as the Madagascar heron, is a species of heron. It is commonly found on the north and west coasts of Madagascar but it is also present in the Comoro Islands and Mayotte. Humblot's heron is considered an endangered species due to its declining population. The major threats the heron faces are poaching, habitat destruction, and the invasion of alien species such as the water hyacinth. [2]
Humblot's heron is part of the subfamily Ardeinae, which are known as "typical herons". [3] It has been suggested that Humblot's heron may be a darker morph of the grey heron due to their many similar physical characteristics, but this claim has been successfully refuted. [4] Humblot's heron was formally described by Henri Milne-Edwards and Alfred Grandidier in 1885.
Local Malagasy names for Humblot's heron include "Kisirano", "Langaro" and "Langaroko", however these names are also associated with different species of herons, such as the grey heron. [5]
The scientific name commemorates the French naturalist Leon Humblot. [6]
Humblot's heron has a uniform dark gray plumage on its body and darker feathers on its forehead and chin. Its nape feathers are elongated to form a crest. It has a large, pale bill as well as pale eyes and legs. [4]
Humblot's heron is 92–100 cm (3.02–3.28 ft) tall. [4] Its body weight can range between 1–1.6 kg (2.2–3.5 lb). [7] [8] The bill length ranges from 13–14.93 cm (5.12–5.88 in) while the bill depth ranges from 2.45–2.69 cm (0.96–1.06 in). [8]
Humblot's heron is endemic to the island of Madagascar and is most commonly found in the coastal lowlands of southern, western and northern Madagascar. Small populations have also been found in the neighboring islands of Comoros and Mayotte. There has been one recorded and accepted observation of the heron in mainland Africa, in a game reserve in Tanzania. [4] The total population of Humblot's heron in Madagascar was estimated in 2006 at 1,000 to 3,000 individuals. [9]
Humblot's heron inhabits fresh, brackish or saltwater wetlands. It prefers tidal areas but also inhabits lakes, rivers, mangroves and estuaries. It is found most commonly at low elevations but has been recorded up to an altitude of 1,500 m (4,900 ft). [4] It does not migrate, however it is able to disperse over long distances, as shown by its presence in mainland Africa. [4]
Humblot's heron primarily eats medium and large-sized fish as well as crustaceans. They forage on floating vegetation in clear, shallow water or in the ingoing and outgoing tides. They are passive feeders, therefore they remain stationary for long periods of time, often hunched or with their neck extended over the water. After catching their prey, they will fly to solid ground to consume it. [4]
Little information is known about its breeding cycle. Nesting has been observed year-round. Nests are typically on the ground and surrounded by dense aquatic vegetation. They can also be found in trees between 5–12 m (16–39 ft) tall. In Mayotte, the heron was observed nesting in mangroves. [10]
The Humblot's heron's nest is mostly made of sticks and reeds and is approximately 50–70 cm (20–28 in) in diameter. Their eggs are blue and the typical clutch size is 3 eggs. Both parents take turns incubating the eggs. [4]
Its vocalizations are similar to the vocalizations of the grey heron. It is an irregular barking sound that lasts 0.5-1.0 s. Humblot's heron is also known to rattle its bill quietly while in its nest. [4]
Humblot's heron is considered endangered, per the IUCN Red List. Its population is declining most likely due to poaching, both of the eggs and of the bird. Additionally, due to the increasing human population in Western Madagascar, the wetlands where the heron nests are being transformed more and more into rice paddies. The increasingly drier climate is also contributing to the degradation of their preferred nesting habitats. The rate at which its population is decreasing has not yet been established. [11]
The great blue heron is a large wading bird in the heron family Ardeidae, common near the shores of open water and in wetlands over most of North and Central America, as well as far northwestern South America, the Caribbean and the Galápagos Islands. It is occasionally found in the Azores and is a rare vagrant to Europe. An all-white population found in south Florida and the Florida Keys is known as the great white heron. Debate exists about whether these white birds are a color morph of the great blue heron, a subspecies of it, or an entirely separate species.
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The glossy ibis is a water bird in the order Pelecaniformes and the ibis and spoonbill family Threskiornithidae. The scientific name derives from Ancient Greek plegados and Latin, falcis, both meaning "sickle" and referring to the distinctive shape of the bill.
The grey heron is a long-legged wading bird of the heron family, Ardeidae, native throughout temperate Europe and Asia, and also parts of Africa. It is resident in much of its range, but some populations from the more northern parts migrate southwards in autumn. A bird of wetland areas, it can be seen around lakes, rivers, ponds, marshes and on the sea coast. It feeds mostly on aquatic creatures which it catches after standing stationary beside or in the water, or stalking its prey through the shallows.
The purple heron is a wide-ranging heron species. It breeds in Africa, central and southern Europe, and southern and eastern Palearctic. The Western Palearctic populations migrate between breeding and wintering habitats whereas the African and tropical-Asian populations are primarily sedentary, except for occasional dispersive movements. It is similar in appearance to the more common grey heron but is slightly smaller, more slender and has darker plumage. It is also a more evasive bird, favouring densely vegetated habitats near water, particularly reed beds. It hunts for a range of prey including fish, rodents, frogs and insects, either stalking them or standing waiting in ambush.
The yellow-crowned night heron, is one of two species of night heron in genus Nyctanassa. Unlike the black-crowned night heron, which has a worldwide distribution, the yellow-crowned is restricted to the Americas. It is known as the bihoreau violacé in French and the pedrete corona clara or yaboa común in some Spanish-speaking countries.
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The western reef heron, also called the western reef egret, is a medium-sized heron found in southern Europe, Africa and parts of Asia. It has a mainly coastal distribution and occurs in several plumage forms: a slaty-grey plumage in which it can only be confused with the rather uncommon dark morph of the Little egret ; a white form which can look very similar to the little egret although the bill tends to be paler and larger and the black form with white throat E. g. gularis of West Africa. There are also differences in size, structure and foraging behaviour. There have been suggestions that the species hybridizes with the Little Egret, and based on this, some authors treat schistacea and gularis as subspecies of Egretta garzetta. Works that consider the Western Reef Heron as a valid species include the nominate gularis and schistacea as subspecies.
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The red shoveler is a species of dabbling duck native to southern South America.
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: CS1 maint: DOI inactive as of May 2024 (link)