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Probability (%) of the presence of social brood parasitism in (a) bumblebee species and (b) ant species in relation to species-specific geographical range size (number of 611 000 km2 grids). In (a), the continuous line is based on all host species for which social brood parasites have been observed, whereas the dashed line is based only on cases in which a breeding queen of a social brood parasite has been observed [32].
