Spatial Heterogeneity in Resource Distribution Promotes Facultative Sociality in Two Trans-Saharan Migratory Birds

doi:10.1371/journal.pone.0021016

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Spatial Heterogeneity in Resource Distribution Promotes Facultative Sociality in Two Trans-Saharan Migratory Birds

Figure 5

Stable carbon and nitrogen isotope values (mean ± SE, ‰) in feathers of Egyptian vultures (triangles) and black kites (circles) grown in their summering (Europe: green) and wintering (Africa: red) grounds.

Numbers in brackets indicate sample sizes.

doi: https://doi.org/10.1371/journal.pone.0021016.g005