The birds of Pasvik / E. I. Khlebosolov, O. A. Makarova, O. A. Khlebosolova [et al. ; English transl. Nikita Chernetsov]. - Ryazan : Golosgubernii, 2007. - 175 с. : ил., портр.

3 .1 .3 . Willow Warb ler and Common Redpoll Common Redpoll is an abundant forest-dwelling passerine in Pasvik. It occurs in different habitats, but is most numerous in pine and mixed birch and pine forests. Here it co-occurs with the Willow Warbler. These species breed in similar habitats and often forage in the same trees, but differ in their foraging behaviour and feed in different parts of crowns. As mentioned above, Willow Warblers forage inside the crowns and move in varying directions when searching for prey. Redpolls, on the contrary, prefer to feed in the outer parts of crowns and pick catkins and whorls in the apical twigs (Fig. 3.13). When feeding, Redpolls jump from above or hang at the twig’s end. After a series o f picks they make a hop or a short flight to a different twig (Fig. 3.14). At the beginning of the reproductive period and when feeding the young. Common Redpolls forage by the same method, even though their diet is somewhat changed. After hatching o f the nestlings, adults start to take some animal food. They pick catkins o f birch, pine and other trees and extract insect larvae, and take imagines from the leaves on the apical branchlets (Khlebosolov 1993). P.K. Blashkin The Common Redpoll is one o f most com ­ mon passerine species and lives in different types o f forest. N (S )= 12(706) Figure 3.13. Foraging zones o f Common Redpolls (1) and Willow Warblers (2) in the crowns o f bushes and trees. Figure 3.14. Succession and frequency o f for­ aging manoeuvres of Common Redpolls. P — pick; H - hop; F - flight; N(S) is the number o f successions, in parenthesis, the overall observation time (s). Numbers show the fre­ quency o f foraging manoeuvres after the pre­ ceding ones. 131