Invasion of Red Crossbill in the steppe part of the Dnieper area in 2004/2005. - V.V. Syzhko. - Berkut. 15 (1-2). 2006. - P. 124.
During the period of investigation (1991–2006) the only but considerable invasion were observed. The first birds have appeared already in early June. From 18.10.2004 to 7.01.2005 the numbers of the species remained at a high level, flocks contained up to 20 birds. The last birds were seen on 15.03.2005. [Ukrainian].