Going back to watch The Walking Dead again from the start, like I did recently, causes you to evaluate many things. One of which is the way that walkers have changed throughout the duration of the show. We spoke to the shows executive producer and director Greg Nicotero about the evolution of walkers in The Walking Dead. Nicotero, who has a rich background in special make up effects, told us that although the shows walkers are there primarily to further the story, he loves to throw some cool zombies in there from time to time because he loves being able to design some weird stuff.Like the recent spiked walker named Winslow from episode 10 of Season 7. It came out of an early conversation with [showrunner] Scott Gimple, he says. I was thinking about the original Planet of the Apes when theyre going through the desert and they see the scarecrows and there were these weird, creepy, foreboding images. And Scott said: Oh, we might have this walker thats like an art installation inside this garbage dump. So we took a motorcycle gas tank and made the helmet out of it.Nicotero says that this season has been an epic one for creative zombies. Even the walkers in the first episode that were crushed by the log pile that was on fire, he says. We had a lot of blistering and sloughing-off skin. And then the walkers on the bridge in episode 6 with Tara. We went for a more desiccated, mummified look they were all dried out because they were under that pile of sand. Its been a great opportunity to keep changing it up season after season and this year weve had a lot of great opportunities.So how will the walkers continue to evolve in future seasons? We know that walkers continue to decay over time I know what well never see. Well never see walking skeletons, says Nicotero.Why? Find out when you watch the video above.