Meet Martha. Except, well... you can't. She died in 1914, alone in a cage, the last passenger pigeon on Earth. She was about 29 when she passed, which is old for a pigeon. Her two male companions died in 1909 and 1910 and after that, she was it. The zoo offered $1,000, roughly $30,000 in today's money, to anyone who could bring her a mate. But nobody ever collected. Her species had been the most abundant bird in North America and possibly the world. Flocks passed overhead for hours and blocked the sun. Audubon watched one migration in 1813 and put it at over a billion birds. Then the telegraph arrived, and the railroads. That's what did them in. Commercial hunters could wire ahead about a flock's location and ship barrels of birds to city markets overnight. Pigeon became the cheapest meat in America. They netted them, shot them, and burned sulfur under roost trees to drop them by the thousand. It only took about fifty years to go from billions to none. Martha was found on the floor of her cage on a September afternoon. They froze her in a 300-pound block of ice and put her on an express train to the Smithsonian. She arrived three days later, and she's still there today.