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The adult male barn swallow of the nominate subspecies H. r. rustica is 17–19 cm (6 + 1 ⁄ 2 – 7 + 1 ⁄ 2 in) long including 2–7 cm (1–3 in) of elongated outer tail feathers.
Additional sites are scattered as far south as the Kopet Dag (Turkmenistan), the Pamir and the Tian Shan . The northern boundary vaguely corresponds to the beginning of the Taiga . [ 143 ] In the Volga basin, interaction with the Srubna culture was the most intense and prolonged, and Federovo style pottery is found as far west as Volgograd .