<p>Overview of experimental set-up: (a) locations of the four feeding stations in the central part of the study area. Each feeding station consisted of a table on which we placed a feeding cage (b) made out of wire mesh (1.5 cm * 1.5 cm) with a solid floor and containing a large peanut reservoir (dashed line). Birds could enter the cage only through a single opening (8 cm * 5 cm) on which we placed a registration antenna for reading pit tags implanted in great tits. The antenna was connected to a stationary decoder underneath the feeding table.</p
