As the Endangered Species Act celebrated its 40th anniversary at the end of 2013, its administrative agency, the US Fish and Wildlife Service, was mired in controversy. At issue was a proposal to remove the gray wolf (Canis lupus) from the List of Endangered and Threatened Wildlife and add the Mexican gray wolf (Canis lupus baileyi).
http://www.sciencedaily.com/releases/2014/02/140207133014.htm