Visual phenotype matching: cues to paternity are present in rhesus macaque faces.

All exhibited positive mean scores, and 56 of 59 participants (94.9%) succeeded (three tests failed to reach significance; all other p -values ≤0.033).

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3 ), but there was a marginally nonsignificant trend for an interaction between line and the rater's level of previous experience with nonhuman primates ( Table 3a ), which suggested a tendency for father-offspring trials to be slightly easier than mother-offspring trials, particularly for inexperienced subjects.

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Excluding these allows the estimate for the intercept in the overall sample to be examined and revealed that the intercept was both positive and highly significant ( Table 2 , Fig. 2 ), as might be expected given the pattern of individual t-tests described in the Methods .

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