For many years, one of Charles Darwin’s theories has been contradicted by recent research. Darwin believed that when an invasive species entered a region where a closely related species already existed, it would not likely be successful because of the competition for resources. “Instead, we found the opposite pattern with amphibians,” said Reid Tingley, a biologist at the University of Sydney in Australia. “When frogs and toads and salamanders invade an area where a similar species exists, they are more, not less, likely to establish themselves.” one explanation for this phenomenon is because for amphibian, if their close relatives are already doing well in the region, it is a positive sign for the new amphibian that is also a suitable region for them. The research could help conservationists to predict the risk levels of introducing specific alien species into a new region