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Swans are birds of the family Anatidae within the genus Cygnus. The swans' close relatives include the geese and ducks. Swans are grouped with the closely related geese in the subfamily Anserinae where they form the tribe Cygnini. Sometimes, they are considered a distinct subfamily, Cygninae. There are six or seven species of swan in the genus Cygnus; in addition there is another species known as the coscoroba swan, although this species is no longer considered one of the true swans. Swans usually mate for life, though "divorce" does sometimes occur, particularly following nesting failure, and if a mate dies, the remaining swan will take up with another. The number of eggs in each clutch ranges from three to eight.
Swans feed in the water and on land. They are almost entirely herbivorous, although they may eat small amounts of aquatic animals. In the water food is obtained by up-ending or dabbling, and their diet is composed of the roots, tubers, stems and leaves of aquatic and submerged plants. Mute swan threatens a photographer in Toyako, Japan.
Although swans only reach sexual maturity between 4 and 7 years of age, they can form socially monogamous pair bonds from as early as 20 months that last for many years,[5] and in some cases these can last for life. The lifespan of the mute swan is often over 10 years, and sometimes over 20, whereas the black-necked swan survives for less than a decade in captivity. These bonds are maintained year round, even in gregarious and migratory species like the tundra swan, which congregate in large flocks in the wintering grounds. The nest is on the ground near water and about a metre across. Unlike many other ducks and geese the male helps with the nest construction. Average egg size (for the mute swan) is 113×74 mm, weighing 340 g, in a clutch size of 4 to 7, and an incubation period of 34–45 days. With the exception of the whistling ducks they are the only anatids where the males aid in incubating the eggs.
Swans are known to aggressively protect their nests. One man was suspected to have drowned in such an attack.
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Support for all Android Mobile Devices
- Alcatel : Alcatel OneTouch Flash Plus
- Acer : Liquid Jade, Liquid E, Liquid M, Liquid Z
- Asus : Memo, Padfone, Zenfone
- HTC : Desire, One M
- Huawei : Ascend, Honor, MediaPad
- Lenovo : Tab, Vibe, A, P
- LG : G, G Flex, G Pro, L
- Motorola : DROID, Moto E, Moto G, Moto Maxx,
- Samsung: Galaxy series, Note serires, Tab serires
- Sony: Xperia C, Xperia E, Xperia M, Xperia Z
- Xiaomi : Mi, Mi Note, Redmi
- Other brand : Gigabyte, I-mobile, Lava, Pantech, Toshiba, T-Mobile, Vodafone, XOLO, ZTE
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