'The Walking Dead' zombies have steadily decayed over six seasons — here's how they've changed

the walking dead zombie season 6
Zombies in the sixth season of "The Walking Dead." Gene Page/AMC

Every season on "The Walking Dead" we're introduced to new characters, new threats, and tons of new zombies who only continue to get more gruesome.

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Though the show has been on the air since 2010, only about two years have transpired in the zombie apocalypse, according to executive producer and make-up supervisor Greg Nicotero. 

That's helped slow down the decaying process a bit, but Nicotero and his visual effects crew continue to evolve the look of the walkers, as they're referred on the hit AMC series, each year.

"Every season we take advantage of the advancement of our timeline," Nicotero recently told Tech Insider. "It's definitely something that we try to push in terms of more skeletal [looks], sloughing off skin, missing noses, exposed ribs, exposed organs, all that stuff. Anything that we can do to further and continually suggest that these are walking, emaciated, decomposing corpses that have been wandering around in the sun, wandering around in the rain, wandering around in the elements for almost two years now." 

While many walkers may be missing limbs now, they didn't always look this frightening.

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Keep reading to see how zombies on "The Walking Dead" transformed over the course of six seasons.

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In season one, we're introduced to the zombie apocalypse about four to five weeks after it has begun.

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The first walker we're introduced to on "The Walking Dead." AMC

Clothes are pretty much intact, and from far away, most zombies could pass for regular people.

the walking dead zombie season one
AMC
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Special effects makeup artist and current executive producer Greg Nicotero and his team from KNB EFX used Robert Kirkman's graphic novel for inspiration.

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Nicotero works on one of the walkers for season one. Scott Garfield/AMC

The crew looked for a specific physical type when casting extras. According to Nicotero, they needed to be tall, thin, and really gaunt.

the walking dead season 1 zombies
AMC
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“In all of Charlie [Adland]’s drawings there’s always teeth so a lot of our hero characters [zombies with full prosthetics] we made dentures that clipped over their lips and then the prosthetic pieces covered the edges of the dentures so it appeared as if the lips had either stretched away or rotted away.” said Nicotero.

walking dead zombie
AMC screencap

The eyes were also very important. "Some of the lenses were bloodshot, some of them had cataracts, some of them were a little yellowish and kind of looked diseased," Nicotero said.

amy the walking dead
AMC

Source: The Hollywood Reporter

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As the walkers continue to decompose in season two, the eyes became even more important.

the walking dead zombies season 2
Gene Page/AMC

“It’s a little more gruesome,” said lens technician Gazal Tabrizpor. “You’ll see more bloodier contacts where the veins had ruptured. The drawing on them is a lot more vivid.”

the walking dead season 2 zombies
Greg Nicotero/AMC

Source: AMC

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Here's a close-up.

the walking dead season 2 walker
AMC

While zombies still look relatively human, an update was also made to dentures worn by walkers as flesh began to tear away more.

the walking dead season 2 zombie
AMC
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When season three premiered in late 2012, zombies began to look noticeably more gaunt.

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Gene Page/AMC

Eyes began to look even more sunken into faces.

the walking dead zombie season 3
Gene Page/AMC
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There was a focus on walkers looking more rotted and decayed.

the walking dead zombie season 3
Gene Page/AMC

“This season, one of the things that we wanted to do was to be able to bash, crush, smash, just destroy some of our walkers,” said Nicotero. To produce the practical gags, a number of hollow zombies were made to splatter blood.

the walking dead zombie
AMC

Source: AMC

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Nicotero and his effects team also added the use of more animatronic puppets like this one with a moving head.

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Greg Nicotero with one of his animatronic zombies. AMC

By the end of season three, there was further discoloration and deterioration to the skin.

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Gene Page/AMC
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Moving into season four, zombies began to decompose even more.

the walking dead season 4 zombie
Gene Page/AMC

At the start of the season, fans have estimated we're approximately 321 days into the zombie apocalypse. Skin has sagged and dried out.

the walking dead season 4 zombies
Gene Page/AMC

Source: The Walking Dead wiki

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Hair begins to diminish.

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Gene Page/AMC

We also saw our first completely charred walker.

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Gene Page/AMC
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Walkers are more prone to falling apart and looking decrepit in season five.

the walking dead zombie walker
Gene Page/AMC

It's more common to see noses missing.

the walking dead season 5 zombie
Gene Page/AMC
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Clothes are tattered and disintegrating. Bodies, especially those exposed to water, are appearing more skeletal in structure.

the walking dead zombie season 5
Gene Page/AMC

"More and more skin decomposes, more and more bone structure and skeletal traits are visible; sometimes the teeth are broken out; sometimes their beards and their hair grows a little bit longer; sometimes their limbs are missing," says Nicotero.

greg nicotero the walking dead season 5
Gene Page/AMC

Source: The Frame

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By the second half of season five, walkers are not looking human anymore. They're becoming mere skin and bone — or close to just bone.

the walking dead season 5 zombie
Gene Page/AMC

Now, on season six, Nicotero continues to push boundaries.

the walking dead season 6 zombies
Gene Page/AMC
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We're seeing some of the most frightening walkers yet.

the walking dead zombie season 6
Gene Page/AMC

Nicotero told Tech Insider walkers will have more moss and branches growing on them in addition to skin sloughing off.

the walking dead zombie season 6
Gene Page/AMC
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We're sure we'll see even more terrifying zombies as the season continues. But one thing's certain.

the walking dead season 6 zombie
Gene Page/AMC

“The only thing you'll never see is a ... perfectly-clean skeleton walking around because obviously, there's no muscle," Nicotero told us. "We still try to keep to the reality of there needs to be muscle to move the bone to move the body."

the walking dead season 6 walker
Gene Page/AMC

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