Figure 1 in Lichens in the nests of European starling Sturnus vulgaris serve a mate attraction rather than insecticidal function

Figure 1. Spatial location of the nests in the study area. Full circles: nests with lichens, empty triangles: nests without lichens, empty circles: the 25% of nests without lichens that started the egg-laying earlier, full triangles: the 25% of nests with lichens that started the egg-laying earlier.