Ross: Chimpanzees are found across the middle swath of Africa, from the westernmost countries on the Atlantic coast as far east as Tanzania. Estimates of wild populations vary, but there are likely not more than 150,000 left in the wild, which is a tragic decline from a population that likely was over 1 million within the last century. In terms of chimpanzees in managed settings, the United States has the most, at around 1,300, but that population is also much smaller than just a couple decades ago when chimpanzees were more prevalent in biomedical research laboratories and bred to combat human diseases such as hepatitis and HIV/AIDS. Today most of the chimpanzees in the United States are housed in sanctuaries where they are retired from lives as research subjects, pets, or performers.