“We used 20 years of data for this paper. According to Rosati, a unique feature of this study is the value that exists in the long-term collection of data. In this study, a team of researchers analyzed 78,000 hours of observations of 21 male chimpanzees made between 19 at the Kibale National Park. “It seemed like it all could sort of fit together, in this cool way, this primatology data to actually test this idea about human cognition,” she says. However, a recent study published in Science on the wild chimpanzees living in Uganda’s Kibale National Park suggests that our friendships may not actually be tied to thinking about the future.Īlexandra Rosati, an evolutionary psychologist at the University of Michigan and one of the study’s lead investigators, had heard about this long-term field study in Uganda. In other words, we have future-oriented cognition. One idea suggests that we become more selective about our friends because we become increasingly aware of our own mortality. When we are older, we tend to focus on maintaining positive, meaningful relationships. Instead of having many superficial relationships, you now have just a few really important friendships. As you grew up, your friendship circle most likely grew smaller. There were probably a lot of children on the playground you considered a friend, but not all of these friendships were very deep. When you were a kid, you most likely had more friends than you do now. After one year, the baby chimpanzees start taking care of themselves.Think back to years past. For the first six months, the mother will carry her baby wherever she goes. Female chimpanzees take good care of their young ones. They usually have a single chimpanzee baby at one time as twins are very rare. The gestation period in female chimpanzees is around eight months. The third kind is a consortship, which is when a male and a female leave the group to live on their own and avoid other chimpanzees. With this kind of mating, the dominant males may become possessive and prevent their subordinates from copulating with the females. In most cases, receptive females are mated by several mature males. The first is called opportunistic, which is characterized by non-competitive mating. There are three types of mating patterns exhibited by chimpanzees. CopulationĬopulation is typically initiated by males. The males are attracted to the additional hormonal scents that the females offer during this time of the cycle. This is due to increase in the level of estrogen hormone. The estrus cycle lasts for 36 days and during that time, the female experiences major changes in the shape, size, and color of the genital skin. Male chimpanzees are capable of reproducing when they are 16 years old whereas females reach estrus (the swelling of the ano-genital region that signifies that the female chimpanzee is ready to breed) at the age of 10. Although mating can occur during any time of the year, it is more common in rainy season. It is also believed that chimpanzees take part in the mating process for social interactions at times. Chimpanzees are polygynandrous, as both male and female chimpanzees have multiple partners. The reproduction system in chimpanzees is very complex, and many misconceptions arose early in the study of these animals about the nature of their mating system.
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