The typical zombie within a horde is nothing special, hard to kill unless you're aiming for the head. Though other forms of wiping them out has been noted such as burning them or a high voltage electrocution. Note, blunt force to the head may or may not kill them instantly depending on the weapon itself. These zombies have also been noted to not being able to cross large bodies of water on their own additionally they seem to slow down in cold weather as if entering a state of hibernation.

Zombie types:
Typical horde zombie

Horde leader:
These zombies are usually upfront and in the rear, they seem to be more weak than a typical zombie but their senses seemed to be heightened in return. It'll be best to take these out first before they find you

"Bruiser" zombie:
They don't have an official name but most people call them bruisers due to them taking a lot more punishment before falling. These zombies tend to be former soldiers, police or generally the type of people who go to the gym daily. Though for the ones that were soldiers they sometimes have decent loot once you manage to take one down. Though for their increased resilience, they are pretty slow

"Runner" zombie:
As most specialized zombie they seem to trade some sort of attribute for another, in their case speed for strength. These zombies are faster and don't seem to tire but at the cost of being weaker but unlike a horde leader they don't have their senses heightened. Usually a single blow to the head will do for them.

This will be update once more sub zombies are encountered