WALKERSTypical Zombies. Slow, moaning, dead. And lots of them everywhere! Very common.
SCREAMERSCreated accidently by Mikko these Zombies are fast, can climb and leap. They hunt in packs and communicate with loud screeches. They have great sense of smell and hearing but are blind.
WITCHESWitches were created in a lab by Bishop. They were meant to hunt and kill Walkers. Witches will sit motionless alone in an area until "awoken" by movement and attack. Though created to hunt walkers they have been known to attack humans.
ECHOSEchoes are evolved Screamers. They look more human have the same abilities as Screamers and hunt in more organized packs. They have learned to mimic human speech but can only echo what they hear. The females of the pack usually call out in distress to lure in victims. They have even been know to call people out into the woods by name.
ANIMALSAnimals are simply infected wildlife. This has made it hard for survivors to find much needed meat.