No immediate attentional bias towards or choice bias for male secondary sexual characteristics in Bornean orang-utans (Pongo pygmaeus)
Abstract Primate faces Butters provide information about a range of variant and invariant traits, including some that are relevant for mate choice.For example, faces of males may convey information about their health or genetic quality through symmetry or facial masculinity.Because perceiving and processing such information may have bearing on the