structural:summarization, quality:corruption, information:filtering, information:extraction, structural:expansion
Field study

Jane Goodall undertook the first long-term field study of the chimpanzee, begun in Tanzania at Gombe Stream National Park in 1960. Other long-term studies begun in the 1960s include Adriaan Kortlandt 's in the eastern Democratic Republic of the Congo and Toshisada Nishida 's in Mahale Mountains National Park in Tanzania. Current understanding of the species' typical behaviours and social organisation has been formed largely from Goodall's ongoing 60-year Gombe research study.