Primates are noted for their varied and complex pelage and bare skin coloration but the
significance of this diverse coloration remains opaque. Using new updated information …

Vocalizations differ substantially between the sexes in many primates, and low-frequency
male vocalizations may be favored by sexual selection because they intimidate rivals and/or …

To successfully navigate their social environments animals need to assess conspecifics.
Quality signals and social recognition are 2 assessment strategies that animals employ to …

Facial recognition plays a key role in human interactions, and there has been great interest
in understanding the evolution of human abilities for individual recognition and tracking …

The mammalian brain is composed of numerous functionally distinct structures that vary in
size within and between clades, reflecting selection for sensory and cognitive specialization …

The 'social complexity hypothesis' suggests that complex social structure is a driver of
diversity in animal communication systems. Sperm whales have a hierarchically structured …

Friendships can foster happiness, health, and reproductive fitness. However, friendships
end—even when we might not want them to. A primary reason for this is interference from …

Sexual dimorphism in ornamentation in primates may have been sexually selected as
signals of rank and dominance to males or by augmenting attractiveness to females. While …

Male sexually selected traits can evolve through different mechanisms: conspicuous and
colorful ornaments usually evolve through intersexual selection, while weapons usually …

Understanding the affective lives of animals has been a long-standing challenge in science.
Recent technological progress in infrared thermal imaging has enabled researchers to …