How come "cries" was used here? Shouldn't it be "cry"?
You're right, the correct way to say this here should be "he cries". The reason it is "cry" in this case is because he is speaking to the gorilla in very basic, broken English to try and communicate with him. When trying to communicate with someone who doesn't speak any English, it is common to talk in basic English and use the very basic forms of words, even if it is not grammatically correct.