Some of the most iconic photographs of Teddy Roosevelt, one of the first conservationists in American politics, show the president posing companionably with the prizes of his trophy hunts. An elephant felled in Africa in 1909 points its tusks skyward; a Cape buffalo, crowned with horns in the shape of a handlebar mustache, slumps in a Kenyan swamp. In North America, he stalked deer, pronghorn antelope, bighorn sheep and elk, which he called "lordly game" for their majestic antlers. What's remarkable about these photographs is not that they depict a hunter who was also naturalist John Muir's staunchest political ally. It's that just 100 years after his expeditions, many of the kind of magnificent trophies he routinely captured are becoming rare.