Distribution and biological peculiarities in Armenia: The species occupies central part of North America, Central and East asia. Armenia is inhabited by subspecies A. s. strepera (Linnaeus, 1758). In Armenian the species is distributed in Lake Arpi, throughout the Lake Sevan basin, in the Araks valley and Spandarian Reservoire, occupying natural and man-made ponds with open water fringed by reeds (Phragmites) and cattails (Typha), marshe and river deltas in mountain steppe and semidesret. Year-round resident. It breeds among reeds, sedges, and bulrushes, having from 6 to10 eggs in the clutch. The fledglings are observed in June-July. The food of the species is mainly consisting of the seeds, leaves, roots and stems of aquatic plants (submerged and emergent) as well as grasses and stoneworts Chara spp., occasionally also taking cereal grains on land. In addition, the species may take a small amount of animal matter during the winter, such as insects, molluscs, annelids, amphibians, amphibian spawn and small fish.