Theoretical models and empirical studies in various taxa have identified important links
between variation in sex roles and the number of adult males and females (adult sex ratio …

Background Comprehensive explanations of behavioral adaptations rarely invoke all levels
famously admonished by Niko Tinbergen. The role of developmental processes and …

Highlights•In bottlenose dolphins, homophily increased from the calf stage to the juvenile
stage.•Calves and juveniles showed high social activity.•Juveniles avoided adult …

Global warming poses a threat to organisms with temperature‐dependent sex determination
because it can affect operational sex ratios. Using a multigenerational experiment with a …

Mouse lemurs (Microcebus spp.) are an exciting new primate model for understanding
human aging and disease. In captivity, Microcebus murinus develops human-like ailments of …

Although play is seen in many species, its evolutionary function is still largely unknown.
Several relevant, proposed hypotheses (such as the training for the unexpected, self …

Glucocorticoids are metabolic byproducts of animals' physiological responses to ecological
or social challenges and are thought to represent an adaptive response allowing beneficial …

In polygynous primates, a greater reproductive variance in males have been linked to their
reduced life expectancy relative to females. The mortality patterns of monogamous pair …

Lemurs, lorises, and tarsiers are socially and ecologically diverse primates that include
some of the most endangered mammals. We review results of long-term studies of 15 lemur …

Evolutionary theories of senescence predict that a high allocation to reproduction during
early life should have long‐term deleterious consequences on future reproduction or …