The American bittern (Botaurus lentiginosus) 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.
It is a well-camouflaged, solitary brown bird that unobtrusively inhabits marshes and the coarse vegetation at the edge of lakes and ponds. In the breeding season it is chiefly noticeable by the loud, booming call of the male. The nest is built just above the water, usually among bulrushes and cattails, where the female incubates the clutch of olive-colored eggs for about four weeks. The young leave the nest after two weeks and are fully fledged at six or seven weeks.
The American bittern feeds mostly on fish but also eats other small vertebrates as well as crustaceans and insects. It is fairly common over its wide range, but its numbers are thought to be decreasing, especially in the south, because of habitat degradation. However the total population is large, and the International Union for Conservation of Nature has assessed its conservation status as being of "Least Concern".
The American bittern is a large, chunky, brown bird, very similar to the Eurasian bittern (Botaurus stellaris), though slightly smaller, and the plumage is speckled rather than being barred. It is 58–85cm (23–33in) in length, with a 92–115cm (36–45in) wingspan and a body mass of 370–1,072g (0.816–2.363lb).[3][4]
The crown is chestnut brown with the centers of the feathers being black. The side of the neck has a bluish-black elongated patch which is larger in the male than in the female. The hind neck is olive, and the mantle and scapulars are dark chestnut-brown, barred and speckled with black, some feathers being edged with buff. The back, rump, and upper tail-coverts are similar in color but more finely speckled with black and with grey bases to the feathers. The tail feathers are chestnut brown with speckled edges, and the primaries and secondaries are blackish-brown with buff or chestnut tips. The cheeks are brown with a buff superciliary stripe and a similarly colored mustachial stripe. The chin is creamy-white with a chestnut central stripe, and the feathers of the throat, breast, and upper belly are buff and rust-colored, finely outlined with black, giving a striped effect to the underparts. The eyes are surrounded by yellowish skin, and the iris is pale yellow. The long, robust bill is yellowish-green, the upper mandible being darker than the lower, and the legs and feet are yellowish-green. Juveniles resemble adults, but the sides of their necks are less olive.[5]
Taxonomy
The American bittern was first described in 1813 by the English clergyman Thomas Rackett from a vagrant individual he examined in Dorset, England.[6] No extant subspecies are accepted.[6] However, fossils found in the Ichetucknee River in Florida, and originally described as a new form of heron (Palaeophoyx columbiana McCoy, 1963)[7] were later recognized to be a smaller, prehistoric subspecies of the American bittern which lived during the Late Pleistocene (Olson, 1974)[8] and would thus be called B. l. columbianus. Its closest living relative is the pinnated bittern (Botaurus pinnatus) from Central and South America.[6]
The generic name Botaurus was given by English naturalist James Francis Stephens, and is derived from Medieval Latinbutaurus, "bittern", constructed from the Middle English name for the Eurasian bittern, botor.[9]Pliny gave a fanciful derivation from Bos (ox) and taurus (bull), because the bittern's call resembles the bellowing of a bull.[10] The species name lentiginosus is Latin for "freckled", from lentigo (freckle), and refers to the speckled plumage.[9]
Many folk names are given for its distinctive call.[11] In his book on the common names of American birds, Ernest Choate lists "bog bumper" and "stake driver".[12] Other vernacular names include "thunder pumper", "bog bull",[13] "bog thumper", "mire drum", and "water belcher".[14]
Distribution and habitat
Its range includes much of North America. It breeds in southern Canada as far north as British Columbia, the Great Slave Lake and Hudson Bay, and in much of the United States and possibly central Mexico. It migrates southward in the fall and overwinters in the southern United States of the Gulf Coast region, most notably in the marshy Everglades of Florida, the Caribbean Islands and Mexico, with past records also coming from Panama and Costa Rica. As a long-distance migrant, it is a very rare vagrant in Europe, including Great Britain and Ireland. It is an aquatic bird and frequents bogs, marshes and the thickly-vegetated verges of shallow-water lakes and ponds, both with fresh and brackish or saline water. It sometimes feeds out in the open in wet meadows and pastures.[5][6]
Behavior
American bittern attempting to hideAmerican bittern (dead center, head extended) hiding in tall grass, Wakulla Springs State Park
The American bittern is a solitary bird and usually keeps itself well-hidden and is difficult to observe. It usually hunts by walking stealthily in shallow water and among the vegetation, stalking its prey, but sometimes it stands still in ambush. If it senses that it has been seen, it remains motionless, with its bill pointed upward, its cryptic coloration causing it to blend into the surrounding foliage. It is mainly nocturnal and is most active at dusk. More often heard than seen, the male bittern has a loud, booming call that resembles a congested pump and which has been rendered as "oong, kach, oonk".[6] While uttering this sound, the bird's head is thrown convulsively upward and then forward, and the sound is repeated up to seven times.[5]
The process by which the bittern produces its distinctive sound is not fully understood. It has been suggested that the bird gradually puffs out its neck by inflating its esophagus with air accompanied by a mild clicking or hiccuping sound. The esophagus is kept inflated by means of flaps beside the tongue. Once this action is completed and the esophagus is fully inflated, the distinctive gulping sound is made in the syrinx. When the sound is finished, the bird deflates its esophagus.[15]
Like other members of the heron family, the American bittern feeds in marshes and shallow ponds, preying mainly on fish but also consuming amphibians, reptiles, small mammals, crustaceans and insects. It is a territorial bird and has a threat display which involves slowly erecting long, white, previously-concealed, plumes on its shoulders, to form wing-like extensions that nearly meet across its back, resembling a ruff. The bird then stands still in a threatening posture, or stalks the intruder in a crouching position, with its head retracted and a gliding gait.[5]
This bird nests solitarily in marshes among coarse vegetation such as bulrushes and cattails, with the female building the nest and the male guarding it. The nest is usually about 15cm (6in) above the water surface and consists of a rough platform of dead stalks and rushes, sometimes with a few twigs mixed in, and lined with bits of coarse grass. Up to about six eggs are laid and are incubated by the female for twenty-nine days. The eggs are bluntly ovoid in shape, olive-buff and unspeckled, averaging 49 by 37mm (1.93 by 1.46in) in size. The chicks are fed individually, each in turn pulling down the female's beak and receiving regurgitated food directly into its beak. They leave the nest at about two weeks and are fully-fledged at six to seven weeks.[5]
Status
The bird's numbers are declining in many parts of its range because of habitat loss. This is particularly noticeable in the southern part where chemical contamination and human development are reducing the area of suitable habitat.[13] However, the bird has an extremely large range and a large total population, and the International Union for Conservation of Nature has assessed its conservation status as being of "least concern".[1] The American bittern is protected under the United States Migratory Bird Treaty Act of 1918.[16] It is also protected under the Canadian Migratory Birds Convention Act of 1994 to which both Canada and the United States are signatories.[17]
The fieldfare or the snowbird is a member of the thrush family Turdidae. It breeds in woodland and scrub in northern Europe and across the Palearctic. It is strongly migratory, with many northern birds moving south during the winter. It is a very rare breeder in Great Britain and Ireland, but winters in large numbers in the United Kingdom, Southern Europe, North Africa and the Middle East. It is omnivorous, eating a wide range of molluscs, insects and earthworms in the summer, and berries, grain and seeds in the winter.
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 72 recognised species, some of which are referred to as egrets or bitterns rather than herons. Members of the genera Botaurus and Ixobrychus 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 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.
The American black duck is a large dabbling duck in the family Anatidae. It was described by William Brewster in 1902. It is the heaviest species in the genus Anas, weighing 720–1,640 g (1.59–3.62 lb) on average and measuring 54–59 cm (21–23 in) in length with an 88–95 cm (35–37 in) wingspan. It somewhat resembles the female and eclipse male mallard in coloration, but has a darker plumage. The male and female are generally similar in appearance, but the male's bill is yellow while the female's is dull green with dark marks on the upper mandible. It is native to eastern North America. During the breeding season, it is usually found in coastal and freshwater wetlands from Saskatchewan to the Atlantic in Canada and the Great Lakes and the Adirondacks in the United States. It is a partially migratory species, mostly wintering in the east-central United States, especially in coastal areas.
The green heron is a small heron of North and Central America. Butorides is from Middle English butor "bittern" and Ancient Greek -oides, "resembling", and virescens is Latin for "greenish".
The little bittern or common little bittern is a wading bird in the heron family, Ardeidae. Ixobrychus is from Ancient Greek ixias, a reed-like plant and brukhomai 'to bellow', and minutus is Latin for 'small'.
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.
The little blue heron is a small heron of the genus Egretta. It is a small, darkly colored heron with a two-toned bill. Juveniles are entirely white, bearing resemblance to the snowy egret. During the breeding season, adults develop different coloration on the head, legs, and feet.
The least bittern is a small heron, the smallest member of the family Ardeidae found in the Americas.
The chestnut-bellied sandgrouse or common sandgrouse is a species of sandgrouse. It is a sedentary and nomadic species that ranges from northern and central Africa and further east towards western and southern Asia. There are six recognised subspecies.
Von Schrenck's bittern or Schrenck's bittern is a small bittern named after Leopold von Schrenck, the 19th-century Russian naturalist.
The Australasian bittern, also known as the brown bittern or matuku hūrepo, and also nicknamed the "bunyip bird", is a large bird in the heron family Ardeidae. A secretive bird with a distinctive booming call, it is more often heard than seen. Australasian bitterns are endangered in both Australia and New Zealand.
The pinnated bittern, also known as the South American bittern, is a large member of the heron family (Ardeidae) found in the New World tropics. Like the other Botaurus bitterns, its plumage is mostly buffy-brown and cryptically patterned. Though it is a widespread species, it is rarely seen – presumably due to its skulking habits – and much about its life history remains little known.
The black-backed bittern, also known as the black-backed least bittern or Australian little bittern, is a little-known species of heron in the family Ardeidae found in Australia and vagrant to southern New Guinea. Formerly lumped with the little bittern, it is one of the smallest herons in the world.
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