TUMACÁCORI, Ariz. — The Santa Cruz River is not like most American rivers. If some of its admirers get their wish, it might also become a wildlife refuge unlike any other. Much of its 184-mile length ...

University of Arizona ecologist Michael Bogan (right) shocks the water in a pool in the Nogales Wash while University of Arizona biologist Peter Reinthal and retired U.S. Fish and Wildlife Service ...