Distribution and biological peculiarities in Armenia: The species occupies northern half and eastern and southern parts of North America, southwestern and southeastern borders of Greenland, northern Europe, western, central and eastern Asia. Armenia is inhabited by subspecies A. p. platyrhynchos (Linnaeus, 1758). In Armenia the species is distributed throughout country, from semidesert to mountain steppe and subalpine habitat, occupying natural and artificial lakes of all sizes covered to varying extents by reeds (Phragmites), sedges (Carex) and cattails (Typha), also rivers, streams, canals, irrigation ditches, wet meadows and other wetlands. Year-round resident. It breeds on river and lakeshores and on islands, placed under trees and bushes, in dense grass and in abandoned nests of suitable size, including those of other species, having from 6 to 16 eggs in the clutch. The fledglings are observed in June-July. The food of the species is mainly consists of seeds and the vegetative parts of aquatic and terrestrial plants (e.g. crops), as well as terrestrial and aquatic invertebrates (especially in the spring and summer) such as insects, mollusks, crustaceans, worms and occasionally amphibians and fish.