Although the practice of collecting animals has been present since 2500 BC (Dunlap and Kellert), efforts to keep the animals in a safe and natural habitat have been poorly accomplished. Psychological manipulation has consequently led chimpanzees to mental illness, as in the article “How abnormal is the behavior of captive chimpanzees living in the zoo?” Lucy P. Birkett and Nicholas E. Newton-Fisher wrote: "Many chimpanzees (Pan troglodytes) kept in laboratory settings exhibit a variety of severe behavioral abnormalities, such as repetitive rocking, urine drinking, or self-mutilation." Social and maternal separation for the benefit of research is also linked to psychological trauma (Dunlap and Kellert). Although throughout history the service of zoos has been entertainment, it is a trivial reason to keep chimpanzees in confidence. As a result, it is inhumane to take primates from the wild and place them in a zoo, commercial environment, or laboratory, which deprives them of their ability to act naturally. Primates housed in organizations such as zoos and laboratories have developed catastrophic behaviors; due to the lack of their natural habitat and the loss of freedom to pursue their own lives. The chimpanzees engaged in attempting abnormal and often revolting behaviors. During their life in captivity they are shown to bite themselves, drink urine, eat feces, caress their genitals, rock, pull their hair and caress their nipples (Birkett and Newton-Fisher). Another factor that pushes chimpanzees to exhibit eccentric habits through physical suffering is that sustained in conditions of captivity. As Dunlap and Kellert explain, “Despite improvements to exhibit design, many animals remain confined to filthy locations, ... middle of paper ... chimpanzees are said to have become an endangered species in 2002 Vital funding for zoo-affiliated research and field work should be found elsewhere, because we cannot manipulate the life of another – human or animal –. Freedom is important in the lives of chimpanzees to support a healthy and healthy lifestyle. Being born and raised in the wild is where chimpanzees should stay. Away from cruel pursuit and taunted to perform in unnatural ways. As Jane Goodall explains, “. . .there is truly no justification for forcing these extraordinary creatures to suffer for our entertainment or gain." Once a rescued chimpanzee is returned to its natural habitat, the glow seen in its presence is unreal. Stop the industry that using chimpanzees for entertainment and testing is truly a terrible problem and more publicity should be spread about their conditions..