Distribution and biological peculiarities in Armenia: The species occupies mainly central Asia. The species is monotypic. In Armenian the species is distributed in Lake Sevan and in the Araks Valley, occupying natural and man-made lakes and ponds surrounded by dense reedbeds (Phragmites). The species returns from the wintering ground usually in April. It breeds deep in reed thickets on a clump of rotted aquatic vegetation, having from 3 to 6 eggs in the clutch. The fledglings are observed in June-July. The food of the species is consisting predominantly of midge (chironomid) larvae and other aquatic invertebrates such as amphipods, isopods and polychaetes (especially in coastal wintering sites. Seeds and the vegetative parts of Potamogeton spp., Ruppia spp. and other aquatic plants are also be taken.