Еуразиялық қызылсары тұқыл құсының сипаттамасы

Species of bird

The Eurasian bittern or great bittern (Botaurus stellaris) is a wading bird in the bittern subfamily (Botaurinae) of the heron family Ardeidae. There are two subspecies, the northern race (B. s. stellaris) breeding in parts of Europe and across the Palearctic, as well as on the northern coast of Africa, while the southern race (B. s. capensis) 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. The nest is usually built among reeds at the edge of bodies of water. The female incubates the clutch of eggs and feeds the young chicks, which leave the nest when about two weeks old. She continues to care for them until they are fully fledged some six weeks later. With its specific habitat requirements and the general reduction in wetlands across its range, the population is thought to be in decline globally. However the decline is slow, and the International Union for Conservation of Nature has assessed its overall conservation status as being of "least concern". Nevertheless, some local populations are at risk and the population of the southern race has declined more dramatically and is cause for concern. In the United Kingdom it is one of the most threatened of all bird species.

This species was first described as Ardea asteria sive stellaris as early as 1603 by Ulisse Aldrovandi in his Ornithologiae. In 1660 the ornithologist Thomas Browne referred to it as Ardea stellaris botaurus and then the Swedish naturalist Carl Linnaeus in his Systema Naturae of 1758 named it again as Ardea stellaris. It is placed in the subfamily Botaurinae, and its closest relatives are the American bittern (Botaurus lentiginosus), the pinnated bittern (Botaurus pinnatus) and the Australasian bittern (Botaurus poiciloptilus). Two races of Eurasian bittern are recognised; the nominate subspecies B. s. stellaris has a palearctic distribution and occurs across a broad swathe of Europe, North Africa and Asia, while the other subspecies, B. s. capensis, occurs only in southern Africa. The name capensis was used for species found in the Afrotropics for which no exact range was known. The generic name Botaurus was given by the English naturalist James Francis Stephens, and is derived from Medieval Latin butaurus, "bittern", itself constructed from the Middle English name for the bird, botor. Pliny gave a fanciful derivation from Bos (ox) and taurus (bull), because the bittern's call resembles the bellowing of a bull. The species name stellaris is Latin for "starred", from stella, "star", and refers to the speckled plumage. Most of these were onomatopoeic colloquial names for the bird; the call was described as "bumping" The powerful bill is greenish yellow with a darker tip to the upper mandible. The eye has a yellow iris and is surrounded by a ring of greenish or bluish bare skin. The legs and feet are greenish, with some yellow on the tarsal joint and yellow soles to the feet. Juveniles have similar plumage to adults but are somewhat paler with less distinct markings.

The breeding range of B. s. stellaris extends across temperate parts of Europe and Asia from the British Isles, Sweden and Finland eastwards to Sakhalin Island in eastern Siberia, Korea and Hokkaido Island in Japan. The bird's northern extent of occurrence is around 57°N in the Ural Mountains and 64°N in eastern Siberia. Its southern limit is the Mediterranean Sea, the Black Sea, Iran, Afghanistan, Kazakhstan, Mongolia and Hebei Province in northern China. Small resident populations also breed in Morocco, Algeria and Tunisia. The southern race has suffered catastrophic decline during the 20th century due to wetland degradation and, unlike the northern race, is of high conservation concern. In 1997 there were 11 males and by 2007 an estimated 44 breeding pairs, concentrated mainly in Lancashire and East Anglia. In 2021, 228 breeding males were counted in the United Kingdom, an increase of 19 birds since 2019. while bitterns have been attracted to new reed beds in the West Country. After extensive reedbed restoration, nesting and breeding was observed in north Wales, while in 2020, two pairs successfully bred at Newport Wetlands in Gwent, south Wales. These were the first bitterns to breed in the county in some 250 years. In the 21st century, bitterns are regular winter visitors to the London Wetland Centre, enabling city dwellers to view these scarce birds. In Ireland, it died out as a breeding species in the mid 19th century, but in 2011 a single bird was spotted in County Wexford and there have been a number of subsequent sightings.