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Swans, genus Cygnus, are birds of the family Anatidae,
which also includes 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 to seven species of swan in the genus
Cygnus; in addition there is another species known
as a swan, the Coscoroba Swan, although this species
is no longer considered related to the true swans.
Swans usually mate for life, though 'divorce' does
sometimes occur, particularly following nesting
failure. The number of eggs in each clutch ranges
from three to eight... |
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