Gorillas are enemies that are found in the Treely Woods and Gola Highlands. They seem to have very poor eyesight, because as long as you walk slowly, you can approach them from the front and they will not see you. They beat their chests when attacking and deal 1 heart's worth of damage to you. A gorilla is involved in the mission The Handle, in which said gorilla has stolen Goliath's axe handle, so you must retrieve it for him so he can chop the log blocking the entrance to Zoomy Lake.
Gorillas sleep often, so the trick to knocking one out is to slowly approach while it is sleeping, and howl at it.