Considerable evidence suggests that the steroid hormone testosterone mediates major life-
history trade-offs in vertebrates, promoting mating effort at the expense of parenting effort or …

Highlights► Elo-rating generates reliable dominance hierarchies and circumvents
drawbacks of established ranking methods.► It allows visualizing dominance relationships …

Body size is a key determinant of male fighting ability and reproductive success in many
animal species, but relationships between these variables have only rarely been examined …

The causes and consequences of being in a particular dominance position have been
illuminated in various animal species, and new methods to assess dominance relationships …

Enduring positive social bonds between individuals are crucial for humans' health and well
being. Similar bonds can be found in a wide range of taxa, revealing the evolutionary origins …

Background Female signals of fertility have evolved in diverse taxa. Among the most
interesting study systems are those of multimale multifemale group-living primates, where …

In primates, females typically drive the evolution of the social system and present a wide
diversity of social structures. To understand this diversity, it is necessary to document the …

Primates rarely learn new vocalizations, but they can learn to use their vocalizations in
different contexts. Such" vocal usage learning," particularly in vocal sequences, is a hallmark …

Acoustic signals function in intrasexual mating competition in a wide variety of species,
including humans. The low voice pitch of human males has been proposed to represent an …

Long-term studies of well-identified individuals and improved methodologies have
advanced primate behavioral ecology, genetics, and physiology (Kappeler & Watts, 2012; …