"Bad Ape is an evolved chimpanzee who appears in War for the Planet of the Apes. Bad Ape lived in the Sierra Safari Zoo in Nevada before the Simian Flu outbreak and was one of the many apes that got more intelligent due to the virus. Bad Ape encountered Caesar's Colony and joined them having found more of his kind and having nowhere else to go. (WIKI)

Bad Ape: Are there more like you? More apes from zoo?
Dead. All dead. Long time. Human get sick. Ape get smart.
Then human kill ape. But not me. I run.
You learned to speak?
Listen. Human. "Bad ape!" Bad Ape.

Bad Ape explains his origin to Caesar.

Bad Ape wiki link:
http://planetoftheapes.wikia.com/wiki/Bad_Ape

This was my favourite film this year. Bad Ape is a cute and smile, funny!"