Zombies

Zombies are undead brain sucking soulless humans. Originally the inhabitants of Jakobs corporations's operation on Pandora at Jakob's Cove. After a terrible outbreak 97% of the population have been turned killed or turned into zombies. The plague has affected not just the town's inhabitants but many of the bandits in the area as well.

Appearance
Zombies come in many shapes and sizes although they are all human-like in appearance.

General Strategy
Zombies are mostly mindless and will attack with little regard to self preservation. For the most part they are susceptible to any damage. Their head is a main target point. In addition, they appear to have a weakness to elemental attacks.

Zombie Types
Zombies come in a variety of types, each of which dictates their combat abilities. All zombies have a melee attack and a 'spit' attack. The spit attack does little to no damage but it can blind you and slow your movement.

Zombie
A Zombie is the basic undead, brain feasting type. The are relatively slow, use no weapons, and will move straight towards the nearest target. They can appear as any of the basic humans in the game, some are still wearing their bear caps.

Tactics: Point, shoot, repeat.

Defiler
Defilers are ranged attack zombies. They have two distinct attacks; a single 'spit' and a 'belch/spew' attack. The belch/spew will cause the defiler to stop moving, let out a belch and begin spewing green vile liquid at you. After a ranged attack, the defiler will quickly move away from you.

Tactics: Avoid ranged attacks, move, shoot

Torso
Torso zombies are legless and forced to crawl along the ground. They are relatively slow and easy to kill. Their one advantage is that they can be hard to spot if there are other zombies attacking you.

Tactics:  Shoot them, or drop an incendiary grenade

Psycho Zombie
Psycho Zombies are undead psycho bandits and behave very similar. They move relatively fast and will run at you.

Tactics: 

Midget Zombie
Midget Zombies are undead midget bandits and behave very similar. They are one of the few zombies that have a good jump ability and can reach you on ledges other zombies can't.

Tactics: 

Suicide Zombies
Suicide Zombies look like bruisers and carry a barrel on their back. They will throw their barrel when they are close enough. Once they reach you they can explode causing explosive damage to you. They have normal movement speed.

Tactics: If you can hit them with a grenade or a rocket launcher before they get close and the barrel they carry will explode damaging them.

Loot Goon
Loot Goons are huge monstrous humanoid. They carry a red weapon chest strapped to their back. They are a tough opponent as they are smarter, stronger and faster than regular undead. The have high health and elemental attacks.

Tactics: Keep your distance, go for the critical hit.