The pressure was on once Darwin had realized Wallace was coming to the same conclusion towards evolution. It was because of Wallace Darwin was rushed to complete the Origin of the Species. Although there were many similarities between the work of Darwin and Wallace, there are some difference in regards to environmental differences, and individual differences of the same species. Looking through the literature there were also differences in how each had come to the conclusion. Unlike Darwin, Wallace was able to explore the world at an earlier age, while Darwin had started much of his work near his home. In 1859 when Darwin received Wallace’s work on natural selection, Darwin created what was actually an abstract of the Origin of species, as he wanted credit towards what he had worked his life towards.