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Figure 4: Proportion of coniferous versus deciduous tree species in the breeding territories of collared flycatchers (CF) and pied flycatchers (PF) subject to experimental cross- fostering of their nestlings on Öland, Sweden, 2002–2009. The territories of collared flycatchers had a relatively higher proportion of deciduous trees as compared to the territories of pied flycatchers. Sample sizes are given above the bars.