it is a bird that swims on water such as a swan or duck.
A bird that swims in the water, so I suppose you could say either bird or both.
The dipper dives and also starts with D also the darter dives under water and so do some ducks.
This is not enough information to identify the bird. You need to see it when it is above water level! I have seen these, and believe you might be referring to what is commonly called a Water Turkey.
I am not sure of the name, But I've heard them called 'water turkey'
No birds live under water. Some, like penguins, may spend a lot of time under water.
penguin
A penguin.
An American dipper is a North American bird which lives in mountain streams, Latin name Cinclus mexicanus.
The White-throated Dipper, in Norwegian: Fossekall.
No, "dipper" is not a prefix. It is a common noun that refers to a type of bird or a kitchen utensil used for scooping liquids.
A wading bird is any of a group of long-legged birds, such as cranes, herons or storks, which wade in shallow water in search of food.