A group of Walkers, after capturing a vampire. It was during the Battle for Walkeria.
Walkers are one of the rarest types of zombies found in real life. They were once are an antagonistic force that serve as the primary catalyst for the events within The Walking Dead universe, and before they were introduce to real life Earth, they serve as universal antagonists, serving as the primary catalyst throughout the events of the franchise.
In real life, despite how a television series, The Walking Dead, portray them, they are NOT aggressive, but are peaceful and gentle creatures, feeding only on small animals, fruits, and fungi, and sometimes, food that are as same as other sapient species. They do not turn their victims into zombies, since they don't carry any diseases or viruses in reality.