Sharonov [Sharonov, A.D.] (1951): (Einige Resultate von Vogeluntersuchungen in der Taigazone Westsibiriens) (Russian). Moskva-Leningrad, [Doklady Akademii Nauk SSSR] 78: 1057-1059
(APUSlist No. 0761)
by IGOR FEFELOV
New information on nesting of some birds in Surgut District of Tyumen Region, West Siberia, Russia.
Common Swift - Apus apus apus.
Not previously known north of Tobol'sk. Author found it nesting northward to 63°
N. Nesting only in tree hollows but not in buildings such as towers, etc.
Departure from Surgut area in mid August.