They're gross and scary, but there's no question that part of The Walking Dead's success is the show's incredibly designed zombies.

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After five seasons, executive producer/special effects makeup guru Greg Nicotero and his team still find ways to make each new walker uniquely horrifying. But along the way, a few specific undead creatures have caught our eyes in ways others haven't.

From the pilot episode's "Bicycle Girl" to that water-logged walker trapped at the bottom of Hershel's well, check out the zombies that have had the most lasting impact on our psyches below.