Humans enter sensitive ecosystems and extract precious specimens to sell for pets, or worse, to sell as ingredients for folk medicine or delicacies. (Kaufman and Franz, 1993, 357). This removal of species from the wild degrades the biodiversity and genetic variety in a system and this could eventually lead to the collapse of the entire ecosystem. Poaching is another harmful impact that humans have on wildlife. . (Kaufman and Franz, 1993, 357). This is caused by human developments encroaching
on wild areas, and because
of deforestation for agriculture or lumber. And finally, humans cause habitat destruction by introducing non-native animals to ecosystems. (1993). For example Australia's wildlife is constantly under attack from introduced species that came to Australia with the settlers like pigs, cane toads, foxes, and goats. Domesticated animals also face human caused problems.