This study was carried out to assess the environmental impact of crude oil exploitation on wild life resources in Bonny forest area of the Niger Delta region of Nigeria. The vegetation cover was sampled by laying 10m-2 quadrate at randomized interval in the study sites. Records were then taken of the plants occurring in the quadrates. Observations on the faunal life in the study soles were carried using direct and indirect methods. The study was carried out principally during the days, but was occasionally extended to the evenings. Primate recorded the highest specie number (5) and rodentia as the highest percentage distribution (70%). Predictably, every 8% reduction in tree cover will make the expected number of animals alive to decline from 1520.10 to 220.50 until the value will become negative (-213.49). The result of the study showed there are 7 orders and 25 species of mammals in the study area. Also, the rate of mortality will increase from 0.14-1.00, and the percentage interval of tree destruction will increase from 153.65 to 249.00. By the time the exploitation of crude oil is in full scale, the balance in the ecosystem will be adversely affected with possible decline in relative abundance of wild life resources. Based on the results, the illeffects of the exploitation, will however be grave when vegetation is destroyed beyond 70% cover.