sentences:  Given the uncertainties over the validity of these forms, this article follows the treatment of Turner and Rose.The short wings, red belly and incomplete breast band of "H. r. tytleri" are also found in "H. r. erythrogaster", and DNA analyses show that barn swallows from North America colonised the Baikal region of Siberia, a dispersal direction opposite to that for most changes in distribution between North America and Eurasia.The preferred habitat of the barn swallow is open country with low vegetation, such as pasture, meadows and farmland, preferably with nearby water.