Walkers. To a human being fighting for survival, they must seem like they’re all the same mindless eating machines. But in fact, the undead come in all shapes and sizes, and as the first season of The Walking Dead proved, no two walker encounters are ever the same. How well can you distinguish the walkers in Season 1? Do you know which one Rick shoots outside the gas station? Can you match up a walker with the character who killed it — and vice versa? Take our Know Your Walkers Photo Quiz, and see how well you heed the undead.