what would happen if predators from the pleictocene still were alive

Question: what would happen if predators from the pleictocene still were alive
- Keywords:
  pleictocene,
  predator
Asked by jeff the best to Jimi on 16 Mar 2016.
- Jimi Wills answered on 16 Mar 2016:
  
  Many of the smaller ones still are!
  
  But I guess you mean the big ones. To be honest, I don’t think things would be much different. Humans have killed off 85% of the mammal species that were on the planet, and we’d probably have killed off the big predators too. Once there were bears and wolves in britain… but not any more!

Question: what would happen if predators from the pleictocene still were alive