Mental map in wild chimpanzees: An analysis of hammer transports for nut cracking

  title={Mental map in wild chimpanzees: An analysis of hammer transports for nut cracking},
  author={Christophe Boesch and Hedwige Boesch},
The mental map of wild chimpanzees is analyzed in the context of their transports of clubs and stones used for cracking two species of nuts of different hardness,Coula edulis andPanda oleosa, in the Tai National Park (Ivory Coast). For the harderPanda nuts, they transport the harder hammers, i.e., almost exclusively stones, hammers of greater weight, and the transports are longer than forCoula nuts. The analysis made for the transports forPanda nuts shows that they seem to remember the location… 

New data on the use of stone tools by chimpanzees in Guinea and Liberia

Two types of use of “hammers” for cracking nuts by wild-living chimpanzees have been distinguished: (1) Relatively small stones are used by the chimpanzee community at Bossou in Guinea to crack the

Tool-use for catching ants by chimpanzees at Bossou and Monts Nimba, West Africa

The use of tools by wild chimpanzees to catch ants was studied at Bossou and Monts Nimba, south-eastern Guinée. Insect-eating by chimpanzees at Bossou appears to be opportunistic and ant-catching was

Transport of Functionally Appropriate Tools by Capuchin Monkeys (Cebus apella)

Capuchin monkeys’ propensity for transporting tools is confirmed, their capacity to select the functionally appropriate tool for two different tool‐use tasks is demonstrated, and they can retain the memory of the correct choice during a travel time of several seconds.

Identifying functional and regional differences in chimpanzee stone tool technology

The earliest hominin archaeological sites preserve a record of stone tools used for cutting and pounding. Traditionally, sharp-edged flakes were seen as the primary means by which our earliest

Sophisticated Euclidean maps in forest chimpanzees

Chimpanzees using stones to crack open oil palm nuts in Liberia

The use of stone-tools to open palm nuts (Elaeis guineensis) was studied in a group of 16 chimpanzees released from captivity to a natural island setting in Liberia, suggesting limited cultural diffusion of the custom.

Distance-decay effect in stone tool transport by wild chimpanzees

Using hammerstones left behind at chimpanzee Panda nut-cracking sites, a distance-decay effect is found, in which the weight of material decreases with increasing distance from raw material sources, which provides a relevant analogy for understanding the formation of hominin landscapes.

Percussive tool use by Taï Western chimpanzees and Fazenda Boa Vista bearded capuchin monkeys: a comparison

The ecological settings in which nut-cracking occurs are described and four aspects of nut-Cracking that have important cognitive implications are focused on, namely selection of tools, tool transport, tool modification and modulation of actions to reach the goal of cracking the nut.

Flexibility of wild chimpanzee nut-cracking behavior using stone hammers and anvils : an experimental analysis

Analysis of experiments such as separating nuts and stones found under palm trees revealed the chimbanzees' flexibility in tool use, which appears to stem from the chimpanzees' understanding of the relationship between tools and referents, i.e. the function of tools.



Optimisation of Nut-Cracking With Natural Hammers By Wild Chimpanzees

The chimpanzees of the Tai National Park, Ivory Coast, use sticks and stones to open 5 different species of nuts. In spite of an unfavourable availability of the material in the forest, the animals

Multiple classification performance of juvenile chimpanzees, normal children, and retarded children

The cognitive capacities of juvenile chimpanzees, normal children, and retarded children were evaluated by using a nonverbal, Piagetian-type multiple classification task, which suggests that the human children used a conceptual strategy, while the juvenile chimpanzees employed a perceptual strategy to solve the multiple classification problems.

Concrete Operational Development in Three Cultures

Berry's (1971) model of ecological functionalism is extended to Piagetian developmental psychology. It is predicted that the rate of development of concrete operations may be partly determined by

Conservation of Liquid and Solid Quantity by the Chimpanzee

Control tests showed that Sarah, an adult "language"-trained chimpanzee, made accurate same-different judgments on quantities of liquid and solid matter and conserved both types of quantity despite a transformation in an irrelevant property (shape).

Chimpanzee Spatial Memory Organization

Juvenile chimpanzees, carried around an outdoor field and shown up to 18 randomly placed hidden foods, remembered most of these hiding places and the type of food that was in each. Their search

Applied Nonparametric Statistics

Applied nonparametric statistics , Applied nonparametric statistics , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی