There will definitely be a lot of animals in the forest which are termed as zombie beasts after getting infected. The only problem is that area is definitely far more dangerous.
There was no information about evolvers hunting the zombie beasts though. They were busy dealing with all the dead walkers which were nearby them.
As for the term zombie beast it came from the pets humans had owned and the street animals. Those cute cats were like bloodthirsty agile demons after becoming beasts and they might have infected most of the uninfected humans.
Thankfully humans had found that unlike human zombies, zombie beasts feared sound and fire. Also they avoid the human zombies too. Once it became known everyone used sounds and eventually beasts left the cities since there were a lot of dead walkers inside them.
Even in this society there were a few of these beasts but they also left.
