The exploitation of California sea lions: "Extensive commercial killing of California sea lions for their blubber (for oil), hides and genitals was carried out in the 19th and early 20th centuries. Although the species was subsequently afforded some protection, sea lions continued to be hunted until the latter half of the 20th century in certain areas of California and Mexico for sport, pet food, hides and other uses. Large numbers were also captured for display. The species was protected in the United States in 1972 by the Marine Mammal Protection Act, and the killing of California sea lions has been banned in Mexico and Canada since 1969 and 1970 respectively." This unlike Australia and NZ where they were hunted to near extinction in the 1800's.