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Precise time-matching in chimpanzee allogrooming does not occur after a short delay

Fig 4

(A) Reciprocity scores (ρi) for within-bout (Δ < 0) grooming by chimpanzee (i): one out of twenty six individual chimpanzees exhibit significant asymmetry in grooming urations () at p = 0.05; (B) Reciprocity scores for delayed (Δ ≥ 0) grooming: all individuals show significant asymmetry () at p = 0.05; (C) Corresponding sample sizes.

Fig 4

doi: https://doi.org/10.1371/journal.pone.0201810.g004