Kōjima, Research island in Kushima, Japan
Kōjima is a 30-hectare forested island situated about 300 meters from the coast of Kushima city in Miyazaki Prefecture, surrounded by the Sea of Hyuga. The Kyoto University Primate Research Institute operates here to conduct long-term behavioral studies of an established Japanese macaque population.
The island and its Japanese macaque inhabitants received National Monument designation in 1934, establishing its significance for scientific research and nature conservation. Since then, it has become a continuous research site that has attracted generations of primatologists.
The research community uses a naming system where male macaques receive animal names and females receive plant names, allowing researchers to track family relationships and inheritance patterns across generations. This practice makes it possible to understand social structures and behavioral traditions among the monkeys.
The Kyoto University Primate Research Institute maintains its main facilities on the mainland, about 13 kilometers from central Kushima, to minimize disturbance to the monkeys. Access to the island itself is restricted and carefully managed to protect research activities and animal welfare.
Monthly weight measurements of the macaques require researchers to place scales with food while managing the challenge of dominant monkeys attempting to control access. This approach shows how scientists gather data while allowing natural behaviors to unfold.
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