Animal testing on non-human primates between the monkeys natural behaviors versus the behaviors expressed by the diazepam induced monkeys in thirteen different locations inside the maze. Scientist Barros and his colleagues created this model to allow the monkeys to roam a less confined environment and slightly eliminate outside factors that may induce stress. Many of the best-known allegations of abuse made by animal protection or animal rights groups against animal-testing facilities involve NHPs. The so-called "pit of despair" was used in experiments conducted on rhesus macaque monkeys during the 1970s by American comparative psychologist Harry Harlow at the University of Wisconsin–Madison.<ref name="Blum1994/95">Blum, Deborah. "The Monkey
Yakushima macaque Yakushima macaques is unknown. Yakushima macaque The Yakushima macaque ("Macaca fuscata yakui") is a subspecies of Japanese macaque that is indigenous to Yakushima Island (Kagoshima Prefecture). It is also known as the Yaku macaque. Compared with "M. f. fuscata" which lives from Honshu to Shikoku and Kyushu, Japan, these individuals are smaller, stockier, have black hands and feet, and a thicker gray coat. Adults have darker fur than infants and juveniles. Adult males have a special feature called a “momoware” (split peach) which parts their hair in the center from right to left. Females bear a single offspring between March