Fig. 2.

Two-way interactions between paternity and mother’s condition, focal age, focal sex and initiation: (a) the difference of the probability of male-infant affiliation was higher for non-sires than sires when considering mother’s condition, (b) the probability to affiliate was initially higher for sires and peaking at two years of focal age, whereas affiliation probability for non-sires exceeded sire-offspring affiliation probability after two years of focal age. The interaction between paternity and initiation of affiliation (c) indicated, that the difference between the probabilities to affiliate was larger for sires considering initiation, with an affiliation probability for sires and offspring being thrice as high than among non-sires and immature individuals. The interaction between initiation of affiliation and focal sex (d) revealed that males were more likely to initiate interactions than focals, especially with male focal subjects. For Fig 2a, 2b and 2c the boxes represent the first to third quartile of observed values, solid vertical lines in the boxes show the median, and dashed vertical lines in the boxes show the values fitted by the model.