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.

Figure 3.26. Structure o f m icrohabitats o f Yellow Wagtails (A) and Meadow Pipits (B) in h um ­ mock peat bog. A В W ~ 0 , 8 0 p P - 1,0— \ у о 0,20 ^ 0,60 ^ P - ° ^ W -0,60 0,60-W S —0,6(b^R—0.20^P ^ W ' 0'20 °-3-! / s W -0 ,7 0 s N(S) = 47 (5680) N(S) = 65 (3021) Figure 3.27. Succession and frequency o f foraging manoeuvres used by Yellow Wagtails (A) and Meadow Pipits (B): F —flight; W —walking; R —running; S —searching for prey; P —pick; N(S) is the number o f successions, in parenthesis the overall observation time (s). Numbers show the frequency o f foraging manoeuvres after the preceding ones. Foraging behaviour o f Yellow Wagtails is rather simple. Usually a bird moves w ithout hurry along the peat and collects various insects. Sometimes it makes short runs on the ground or rushes into the air and captures mobile prey (Fig. 3.27). Meadow Pipits occur in the same habitat. In the optimal habitats their breed­ ing density may reach 15 pairs • km \ The size o f breeding territories is ca. 5 ha ( Fig. 3.25). Spatial distribution o f Meadow Pipits is somewhat different from that o f Yellow Wagtails. The former species prefers to forage in the area o f the bogs with hum ­ mocks ca. 9 cm high. The areas between the hummocks are covered with water, silt, or wet moss (Fig. 3.26). Foraging behaviour o f Meadow Pipits also differs from the previous species. When feeding, the bird moves between the hummocks w ithout hurry and looks for immobile invertebrates, picks them from the ground or extracts from silt at the base o f hummocks. Sometimes the bird climbs a hummock and looks for prey or its pos- 146