The federal listing of the Black-capped Vireo as an endangered species validates environmentalists' demand that development be limited in sensitive areas like Barton Creek.
The Endangered Species Act was very, very important. This was not something that we could do on our own. We had to have the help of the federal government...Being able to use federal legislation in order to enforce some of the scientific evidence and to get some things done at the federal level that related to ways to preserve things.
— Mary Arnold, Environmental Advocate
Texas Parks and Wildlife