This paper suggests a tentative analysis of continuous female sexual receptivity based on a random sample of mammals and birds. It is suggested that humans developed continuous female sexual receptivity because humans have the unusual combination of long infant dependency, group living, and male-female bonding.

In this article, the authors seek to understand the predictors of land privatization by empirically testing defendability and resource stress theory. By drawing on previous research they are able to test these theories in more expansive and nuanced ways. They conclude that they have found strong support for defendability theory.

This article discusses two different explanations of male initiation ceremonies. Evidence is also presented that suggests that psychological conflict might strongly predict male initiation in the presence of the following catalysts: nonmatrilocal residence, nonstate political organization, and warfare.

This article examines resource problems and warfare in a sample of societies from eastern Africa. The frequency and predictability of resource problems are examined, as are two other dimensions of warfare: resource-taking and commission of atrocities. Differences between state and nonstate societies, as well as pacified and non-pacified societies, are also examined and shown to affect associations between resource and warfare variables.

In this article, the authors seek to understand the predictors of land privatization by empirically testing defendability and resource stress theory. By drawing on previous research they are able to test these theories in more expansive and nuanced ways. They conclude that they have found strong support for defendability theory.

In this article, the authors seek to understand the predictors of land privatization by empirically testing defendability and resource stress theory. By drawing on previous research they are able to test these theories in more expansive and nuanced ways. They conclude that they have found strong support for defendability theory.

In this article, the authors seek to understand the predictors of land privatization by empirically testing defendability and resource stress theory. By drawing on previous research they are able to test these theories in more expansive and nuanced ways. They conclude that they have found strong support for defendability theory.

This article examines resource problems and warfare in a sample of societies from eastern Africa. The frequency and predictability of resource problems are examined, as are two other dimensions of warfare: resource-taking and commission of atrocities. Differences between state and nonstate societies, as well as pacified and non-pacified societies, are also examined and shown to affect associations between resource and warfare variables.

This study explores several correlates of interpersonal violence. Multiple regression analysis suggests that socialization for aggression in boys in late childhood is the strongest predictor of higher rates of homicide and assault. Path analysis suggests that socialization for aggression is a consequence, not a cause, of war.

This study examines the relationship between sexual dimorphism and degree of polygyny. Authors test this relationship in both humans and non-human species. In non-human species, every correlation between sexual dimorphism (measured by body length) and degree of polygyny was significant. In human populations, sexual dimporhism was not related to degree of polygyny, however, there were some differences between populations with socially imposed monogomy and those with ecologically imposed monogamy.