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There are six living and many extinct species of swan; in addition, there is a species known as the coscoroba swan which is no longer considered one of the true swans. Swans usually mate for life , although separation sometimes occurs, particularly following nesting failure, and if a mate dies, the remaining swan will take up with another.
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Swan goose: Anser cygnoides (Linnaeus, 1758) 22 Taiga bean goose: Anser fabalis (Latham, 1787) 23 Pink-footed goose: Anser brachyrhynchus Baillon, 1834: 24 Tundra bean goose: Anser serrirostris Gould, 1852: 25 Greater white-fronted goose: Anser albifrons (Scopoli, 1769) 26 Lesser white-fronted goose: Anser erythropus (Linnaeus, 1758) 27 ...
The ducks, geese, and swans are small- to large-sized birds with a broad and elongated general body plan. [2] Diving species vary from this in being rounder. Extant species range in size from the cotton pygmy goose , at as little as 26.5 cm (10.5 in) and 164 g (5.8 oz), to the trumpeter swan , at as much as 183 cm (6 ft) and 17.2 kg (38 lb).
The mute swan (Cygnus olor) is a ... England have for centuries been trained to ring bells via strings attached to them to beg for food. Two swans are still able to ...
The black-necked swan's diet is almost entirely vegetarian. It feeds on aquatic plants like Chara, Potamogeton, Typha; algae such as Aphantotece and Rhyzoclonium; and presumably small numbers of aquatic invertebrates. In parts of Chile its principal food is Egeria densa. It forages mostly by immersing its head and neck and by surface feeding ...
The swans' closest relatives include the geese and ducks. Swans are grouped with the closely related geese in the subfamily Anserinae where they form the tribe Cygnini . There are six living and many extinct species of swan; in addition, there is a species known as the coscoroba swan which is no longer considered one of the true swans.
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 ...