A key difference between human and chimpanzee aggression is that humans are found to have a greater inclination than other primates for proactive aggression – meaning aggression that is more thought-out or planned. When she bit my shoelaces, I feigned interest in nearby millipedes or butterflies to redirect her attention elsewhere. For chimps like Gnala, human touch set a particular kind of harm in motion. , Vocalisations are also important in chimp communication. Since the early reports on Washoe, numerous other studies have been conducted, with varying levels of success. , Debate is ongoing among scientists such as David Premack about chimpanzees' ability to learn language. During aggressive encounters, displays are preferred to attacks. Earlier this week, a 14-year-old, 200-pound (90-kilogram) pet chimpanzee in Stamford, Conn., left a woman in critical condition after attacking her—mutilating her face and hands. Road building has caused habitat degradation and fragmentation of chimpanzee populations, and may allow poachers more access to areas that had not been seriously affected by humans. Gnala and Kimbang finish half a papaya, and Kimbang springs up a tree. As much as humans tried to prepare her, and as much as Jantan will try to defend her, Gnala must find her way on her own. During my fieldwork in chimpanzee sanctuaries, I would be bitten—multiple times—by Gnala. Baby chimpanzees are, of course, incredibly cute, which makes some people believe they can raise them the same way they would a domesticated pet. During an arboreal hunt, each chimp in the hunting groups has a role. Although Gnala is one of the lucky orphans that made it to a sanctuary where humans encourage her chimpness, there is always a tipping point. [a], The chimpanzee is more robustly built than the bonobo but less than the gorilla. Gnala’s name soon became a running joke. Chimpanzees are our closest relatives among the great apes. They discourage wildlife enthusiasts from visiting “fake sanctuaries” that let tourists play with wild animals. Most such laboratories either conduct or make the animals available for invasive research, defined as "inoculation with an infectious agent, surgery or biopsy conducted for the sake of research and not for the sake of the chimpanzee, and/or drug testing". It happens more often with people they don't know very well and people who aren't familiar with chimpanzees. We move through the forest with her on our backs. Some scream or bang their heads against things, while others bite the caregivers who try to comfort them. In December 2003, a preliminary analysis of 7600 genes shared between the two genomes confirmed that certain genes, such as the forkhead-box P2 transcription factor which is involved in speech development, have undergone rapid evolution in the human lineage. Earn Transferable Credit & Get your Degree.