Waterfowl are birds that are able to confidently stay on the surface of the water for a long time. As a rule, they lead an aquatic lifestyle, that is, they rarely get out on land. The basis of food in this case is fish and small aquatic inhabitants crustaceans, plankton, insects.
The main feature of all waterfowl is the presence of webbing between the fingers. Thanks to them, the bird is able to move in the water, and developing a decent speed. Also, the membranes serve to enable quick maneuvering on the water surface.
Black-billed (polar) loon
Grebe (great grebe)
Arama (herding crane)
Sterkh (white crane)
Coot (water chicken)
Waterfowl include a large number of bird species. Perhaps the most famous of them are ducks, swans and geese, since among them there are subspecies for home keeping. Most of the birds that can swim on water are inaccessible to the gaze of a simple city dweller. To see them, you need to visit water bodies, and often remote and hard-to-reach.
In addition to the general diet and webbed feet, all waterfowl are equipped with a coccygeal gland. She develops a special secret that lubricates feathers. This is a kind of fat that makes the feather cover waterproof and increases thermal insulation. The developed subcutaneous fat layer also contributes to the preservation of heat. That is why birds can swim even in very cold water, often mixed with ice.
Despite the common food base, waterfowl species do not interfere with each other and do not have interspecific competition. Separation is carried out due to different ways of obtaining food, as well as different depths from which it is extracted. For example, seagulls grab fish right in the process of flight, and diving ducks dive into the depths after it.