Army of the Dead, features all kinds of impressive stunts and visual effects—but one of the more memorable is that surprisingly convincing undead horse. In a new behind-the-scenes featurette on the Netflix Film Club's YouTube channel, special effects makeup artist Gabe Bartalos breaks down exactly how they created this particular part of the movie using entirely practical effects. "We knew that it wouldn't be slimy and drippy," he says. "We looked at pictures of when animals, specifically deer and horses, decay. The skin begins to deteriorate, and what's left is all the veins and arteries. It becomes this mesh of mess. So we used a lot of organic materials suspended in latex, infused into the skin. There's the sculping of the muscles, of the bones, of the skin, the way I paint it, the way I weather it. The challenge of a horse, the sheer velocity of the animal, is a real thing to consider."