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face-like stimuli are likely perceived as harmless by newborns of social species that practice parental care but as threatening by newborns of solitary species without parental care.
researchers should not assume that an innate attraction to face-like stimuli is necessarily an adaptation related to social interaction or parental care.
researchers can assume that the attraction to face-like stimuli that is seen in social species that practice parental care is learned rather than innate.
newly hatched Testudo tortoises show a stronger preference for face-like stimuli than adult Testudo tortoises do.