Abstract HTML Views: 534 PDF Downloads: 224 Total Views/Downloads: 926
Abstract HTML Views: 381 PDF Downloads: 160 Total Views/Downloads: 664
We reported about several common terns with dark bill (subspecies Sterna hirundo minussensis and S. h.
longipennis) in the Lower Ob region of Western Siberia, including nesting of the Central Siberian tern here. The ratio of
terns with a dark bill and nominate color was about 8 to 1. Our findings change the previous understanding of areas of the
distribution of those subspecies.