The study conducted by Slocombe and Zuberbuhler on food-associated calls in chimpanzees contained two interesting hypotheses. The first one states that the various vocalizations that are produced by these chimpanzees upon finding food are based on the three types of food preference groups that rank from high to low. The second hypothesis says that these sounds made when the chimpanzee encounters the food label particular food types.
These hypotheses were tested on both wild and captive chimpanzees using two distinct methods. First, the psychologists observed 53 wild chimpanzees of all different ages and sexes in the Budongo Forest over a period of six months (January-March). During this time they found that the three most chosen foods of the animal were bread, mango and banana, and they were put into the high preferred category. They then did the same thing for both medium and low preferred foods. In the second study, for a period of four months (May-September) the......
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