Whether vagrants of birds are casual? (On an example of ornithofauna of the Sura river valley). - A.E. Lugovoy. - Berkut. 9 (1-2). 2000. P. 133-135.
Reasons of vagrants of birds are discussed. The Sura river is situated in Mordovia (Russia). It is supposed, that they are not casual and have some regularities. Vagrants of some species can be concerned with the geological past and changes of breeding ranges. [Russian].
Key words: birds, vagrant, migration, breeding range.
Address: A.E. Lugovoy, Ostrovnaya str. 20/21, 88000 Uzhgorod, Ukraine.