Ferals

noun

1. A domesticated animal that has returned to the wild; an animal, particularly a domesticated animal, living independently of humans.
2. A contemptible young person, a lout, a person who behaves wildly.
3. A person who has isolated themselves from the outside world; one living an alternative lifestyle.
4. (furry subculture) A character in furry art or literature which has the physical characteristics (body) of a regular animal (typically quadripedal), that may or may not be able to communicate with humans or anthros (contrasts anthro)

   "The story is about a group of ferals which have to explore the ruins of society after the humans die out."