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Showing posts with label BLACK SWAN (Cygnus atratus). Show all posts
Showing posts with label BLACK SWAN (Cygnus atratus). Show all posts

Thursday, 29 June 2023

27-6-2023 VIVEROS GARDENS, VALENCIA - BLACK SWAN (Cygnus atratus)

The black swan (Cygnus atratus) is a large waterbird, a species of swan which breeds mainly in the southeast and southwest regions of Australia. Within Australia, the black swan is nomadic, with erratic migration patterns dependent on climatic conditions. It is a large bird with black plumage and a red bill. It is a monogamous breeder, with both partners sharing incubation and cygnet-rearing duties.

The black swan was introduced to various countries as an ornamental bird in the 1800s, but has managed to escape and form stable populations.


The black swan is common in the wetlands of southwestern and eastern Australia and adjacent coastal islands. In the south west its range encompasses an area between North West Cape, Cape Leeuwin and Eucla; while in the east it covers a large region bounded by the Atherton Tableland, the Eyre Peninsula and Tasmania, with the Murray Darling Basin supporting very large populations of black swans. It is uncommon in central and northern Australia.

The black swan's preferred habitat extends across fresh, brackish and salt water lakes, swamps and rivers with underwater and emergent vegetation for food and nesting materials. It also favors permanent wetlands, including ornamental lakes, but can also be found in flooded pastures and tidal mudflats, and occasionally on the open sea near islands or the shore.


Like other swans, the black swan is largely monogamous, pairing for life (about 6% divorce rate). Recent studies have shown that around a third of all broods exhibit extra-pair paternity. An estimated one-quarter of all pairings are homosexual, mostly between males. They steal nests, or form temporary threesomes with females to obtain eggs, driving away the female after she lays the eggs.

Monday, 29 August 2016

19-3-2015 JURONG, SINGAPORE - BLACK SWAN (Cygnus atratus)


The black swan (Cygnus atratus) is a large waterbird, a species of swan which breeds mainly in the southeast and southwest regions of Australia. Within Australia, the black swan is nomadic, with erratic migration patterns dependent on climatic conditions. It is a large bird with black plumage and a red bill. It is a monogamous breeder, with both partners sharing incubation and cygnet-rearing duties.

The black swan was introduced to various countries as an ornamental bird in the 1800s, but has managed to escape and form stable populations. Described scientifically by English naturalist John Latham in 1790, the black swan was formerly placed into a monotypic genus, Chenopis. Black swans can be found singly, or in loose companies numbering into the hundreds or even thousands. It is a popular bird in zoological gardens and bird collections, and escapees are sometimes seen outside their natural range.

This bird is a regional symbol of both Western Australia, where it is native, and the English town of Dawlish, where it is an introduced species.

Wednesday, 18 May 2016

18-5-2016 VIVEROS GARDENS, VALENCIA - BLACK SWAN (Cygnus atratus)


The Black swan (Cygnus atratus) is a large unmistakeble waterbird, a species of swan. It is one of only three swan species that inhabit the southern hemisphere. The Black swan was introduced to various countries as an ornamental bird in the 1800s but has managed to escape and form stable populations. It is a popular bird in zoological gardens and bird collections, and escapees are sometimes seen outside their natural range.

The body of an adult Black swan is mostly black, except for its broad white wing tips, visible in flight. Its bill is bright red, having a pale tip and bar, and its feet and legs are grayish-black. Its neck is long (the longest neck amongst swans, relative to its size) and it is curved into an "S"-shape. The males are slightly bigger than the females and have longer and straighter beaks. Juvenile Black swans are grayish-brown with lighter-edged feathers.


Black swans are natives of Australia, including Tasmania, and mainly occur in Australia's south-eastern and south-western wetlands. These birds were once thought to be sedentary, but are now known to be highly nomadic. There is no set migratory pattern, but rather opportunistic responses to either rainfall or drought. Black swans inhabit rivers, lakes, and swampland in water that is fresh, salt, or brackish. They prefer habitats that have aquatic vegetation but sometimes live in terrestrial areas like flooded fields or dry pastures when food is scarce.



Black swans are active during the day and feed in a similar manner to other swans. When feeding in shallow water they will dip their heads and necks under the water and they are able to keep their heads flat against the bottom while keeping their bodies horizontal. In deeper water swans up-end to reach lower. Black swans are also able to filter feed at the water's surface. These beautiful birds may be found on their own but they also often form loose groups consisting of several hundred or sometimes thousands of birds. They usually move in flocks, sometimes nest in colonies, and are the least territorial of swan species. They are strong fliers, traveling together in a line or V shape, beating their wings slowly, and making whistling noises. On the water as well as in flight, Black swans make a range of high-pitched, musical, bugling, baying, or trumpeting calls. They have also been heard to make a variety of softer crooning notes. If disturbed while nesting they usually make a whistling sound.


Black swans are monogamous and often have the same mate for life. They are territorial and remain in solitary pairs during mating but occasionally mate in colonies. February through September is the breeding season. Usually, the female swan makes a nest from sticks, debris, and dead leaves into a mound floating on the water. She lays 5 to 6 eggs, one day apart. Incubation starts once all the eggs are laid and lasts 35 to 48 days. Males help with incubation. The cygnets are precocial and can swim and feed soon after hatching; however, they are brooded in the nest after hatching for a period of 2 to 3 weeks. They fledge between 150 to 170 days old. Black swans can fly at about 6 months old and stay with their family group for about 9 months. They reach reproductive maturity within 18 to 36 months.

Population size
100,000-1Mln
Life Span
40 years
Top speed
80
km/hmph
km/h mph 
Weight
3.7-9
kglbs
kg lbs 
Length
110-142
cminch
cm inch 
Wingspan
1.6-2
mft