 52 (1936).One year after the eagle feather decision in Andrus, the Court decided Agins v. Tiburon, 447 U.S. 255 (1980).In Agins the Court stated that the application of land-use regulations to a particular piece of property is a taking when it denies the land's owner reasonable, viable use of it, or "if the ordinance does not substantially advance legitimate state interests ... or denies an owner economically viable use of his land."