Anseriformes (Aquatic Birds)
Anseriformes are a group of birds, highly adapted for life on the water surface. These include the swans, ducks and geese.
They have in common a long tongue which is used to draw water ifrom the front of the bill and expel it through the sides. This enables the water to be filtered to extract food which is then swallowed. This bill structure is retained even by those that have developed to graze on land or dive for food.
The feet are relatively large and webbed to provide propulsion in the water.
One family is of interest to the birds in Langstone Harbour – Anatidae