There are over 120 different species of ducks. Ducks are primarily aquatic birds, like geese, and live around both salt and fresh water. Ducks live all over the world with the exception of Antarctica. Some duck species are migratory. This is true particularly of ducks living in the Northern Hemisphere. Tropical ducks will generally not seasonally migrate. Most ducks stay around the same living area (pond, park, etc.), however, if their habitat is subject to droughts or similar seasonal changes, they will adapt a more nomadic lifestyle.
Duck is the common name for numerous species of waterfowl in the family Anatidae. Ducks are generally smaller and shorter-necked than swans and geese, which are members of the same family. Divided among several subfamilies, they are a form taxon; they do not represent a monophyletic group (the group of all descendants of a single common ancestral species), since swans and geese are not considered ducks. Ducks are mostly aquatic birds, and may be found in both fresh water and sea water.
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