Abstract
In this investigation a group of common marmosets (Callithrix jacchus) consisting of two parents and their six progeny of various ages were allowed free access to an open-air enclosure, which was equipped with a heated hut, roofed veranda, external cage, and a runway system made of roofing slats and a few small trees. Feeding places, sitting boards and sleeping boxes were distributed throughout the whole area. This investigation covered a total of 254 hours of observation. The hut and its immediate vicinity can be considered as being the core area of the home-range, as the maximum frequencies of both feeding and location occurred there. Through the experimental variation in the type of foods provided at specific feeding places, it was obvious that the closeness of the feeding place to the hut was more important to the marmosets than the type of food placed there. The marmosets apparently reduced the energy output when searching for food by minimizing the distance to the food patches.
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