The longest cat fence in the U.S. was just built on a Hawaiian volcano

Should you be lucky enough to find yourself on Hawaii’s Big Island, you are welcome to visit Mauna Loa, the largest volcano in the world. Cats, however, are not — a point now being enforced by a new 5-mile-long fence constructed for the sole purpose of keeping felines away. Mauna Loa’s lava-covered slopes make for some seriously forbidding landscape, but that hasn’t deterred cats, which have adapted to the Hawaiian islands just fine since arriving on explorers’ ships. So fine, in fact, that the little invasive predators are now a mortal threat to the endangered Hawaiian petrel, a seabird that breeds on Mauna Loa. Several thousand of the birds live in Hawaii, but only about 75 pairs are on the Big Island. To protect the petrels, the National Park Service and other organizations spent three years flying in people and materials to build the cat-proof barrier, a 6-foot-tall fence topped with a curved section that even the wiliest kitty is not supposed to be able to scale. It’s the longest anti-cat fence in the United States, and it encloses 600 acres of 8,000- to 10,000-foot-high terrain that petrels, also known as ‘u’au, view as choice breeding territory...more

They don't have enough money to maintain the facilities at Yellowstone, but they do have money for "flying in people and materials" to build five miles of cat-proof fence?