According to behavioural ecology theory, sociality evolves when the net benefits of close
association with conspecifics exceed the costs. The nature and relative magnitude of the …

There is much interest in the evolutionary forces that favored the evolution of large brains in
the primate order. The social brain hypothesis posits that selection has favored larger brains …

Longevity is a major component of variation in fitness in long-lived iteroparous species [1–4].
Among female baboons, variation in breeding lifespan accounts for approximately 50% of …

In many social mammals, females who form close, differentiated bonds with others
experience greater offspring survival and longevity. We still know little, however, about how …

In most social mammals, some females disperse from their natal group while others remain
and breed there throughout their lives but, in a few, females typically disperse after …

For social species, the environment has two components: physical and social. The social
environment modifies the individual's interaction with the physical environment, and the …

The precise quantitative nature of the Environment of Evolutionary Adaptedness (EEA) is
difficult to reconstruct. The EEA represents a multitude of different geographic and temporal …

Group size is an important trait of social animals, affecting how individuals allocate time and
use space, and influencing both an individual's fitness and the collective, cooperative …

We examine the relationship between glucocorticoid (GC) levels and grooming behavior in
wild female baboons during a period of instability in the alpha male rank position. All …

Growth rate is a life-history trait often linked to various fitness components, including
survival, age of first reproduction, and fecundity. Here we present an analysis of growth-rate …