Fig. 2
From: Exploring the drivers of inter- and intraspecific differences in prosociality in four parrot species
Proportion of landings on provider perch (position 0) in relation to the total trial number per species in the last two test sessions of the group service phase (IV) according to (A) Cooperative breeding, (B) Proportion of proactive and reactive food provisions per species. (C) Nesting type, and (D) Social tolerance measured by Pielou’s J. Birds that landed more often in the test compared to either control condition are highlighted in solid points (N = 15 birds), birds that did not pass the criterion (N = 17) are shown with transparent points and cheaters are indicated with triangles. AGP African grey parrots, BHM blue-headed macaws, EC Eclectus, GA Galahs.
