John J. Rhodes of Arizona commented about Karl saying, "He was truly a pioneer in the field of conservation. He served his State as a member of its Fish and Game Commission, and headed up the Izaak Walton League’s National Wildlife Preservation efforts. He saw the danger to many species and was early on in the fight to preserve them from extinction".
"Conservation: Karl Mundt was elected State President of Izaak Walton League in South Dakota in 1929. Appointed for a six-year term in 1931 to SD Bipartisan Game and Fish Commission. Served as National Vice-President of Izaak Walton League in 1937 and was a member of National Executive Board in 1938 when elected to Congress. Editorial writer for OUTDOOR AMERICA, published in Chicago. Contributor of numerous magazine articles on conservation principles and their relationship to successful farming and healthful recreation. Pioneered in Congress for effective water pollution control legislation and is congressional sponsor of funding amendments establishing the Endangered Wildlife Species Research Facility at Patuxent Wildlife Center, Laurel, Maryland. Selected as honorary life member of Whooping Crane Conservation Association." 1
Edward A. O'Neill said of Karl, "[He] kept constant pressure on the Department of the Interior to get better protection of endangered species of wildlife and is credited with the actions that seems to have saved the whooping crane."
"The late Sen. Karl Mundt saw no conflict between abundant wildlife and prosperous agriculture. He was the force behind the Small Wetland Acquisition act that saved countless wetlands from drainage. State lawmakers should follow the example of the late Rep. George Mortimer of Belle Fourche, who ably represented his ranching constituency but was a fierce defender of natural resources." 2