Sara Johnson

Firearm violence is a major public health problem in the United States. In 2000, firearms were used in 10,801 homicides – two-thirds of all homicides in the U.S. – and 533,470 non-fatal criminal victimizations including rapes, robberies, and assaults. The social costs of gun violence in the United States are also staggering, and have been estimated to be on the order of $100 billion per year.Illegal gun carrying, usually concealed, in public places is an important risk factor for firearm-related crime. In the 1980s and 1990s, police departments across the country began to develop and implement strategies to address illegal weapons carrying. Often these strategies have involved aggressive efforts to identify and physically search individuals suspected of illegally carrying a firearm.

We hypothesize that juvenile baboons are less efficient foragers than adult baboons owing to their small size, lower level of knowledge and skill, and/or lesser ability to maintain access to resources. We predict that as resources are more difficult to extract, juvenile baboons will demonstrate lower efficiency than adults will because of their lower levels of experience. In addition, we hypothesize that juvenile baboons will be more likely to allocate foraging time to easier-to-extract resources owing to their greater efficiency in acquiring those resources.We use feeding efficiency and time allocation data collected on a wild, free-ranging, non-provisioned population of chacma baboons (Papio hamadryas ursinus) in the Moremi Wildlife Reserve, Okavango Delta, Botswana to test these hypotheses. The major findings of this study are:1. Juvenile baboons are significantly less efficient foragers than adult baboons primarily for difficult-to-extract resources.We propose that this age-dependent variation in efficiency is due to differences in memory and other cognitive functions related to locating food resources, as is indicated by the greater amount of time juvenile baboons spend searching for food. There is no evidence that smaller body size or competitive disruption influences the differences in return rates found between adult and juvenile baboons in this study.2. An individual baboon’s feeding efficiency for a given resource can be used to predict the duration of its foraging bouts for that resource.These results contribute both to our understanding of the ontogeny of behavioral development in nonhuman primates, especially regarding foraging ability, and to current debate within the field of human behavioral ecology regarding the evolution of the juvenile period in primates and humans