Red wolves and grey wolves may have once been a single species. But throughout the 1900s, the interbreeding of coyotes and red wolves blurred the line between species. How can we determine whether red and grey wolves are the same or separate species? The question is a pressing one, if you consider that conservation efforts are based on species. In 1973, the Endangered Species Act was passed, creating the Endangered Species List, which mandates conservation efforts for every animal and plant on the list – based on species. Without a clear definition, conservationists don’t know what exactly they are trying to protect…