Gorillas

Gorillas could live in the jungle and travel in groups. If players comes too close to a gorilla group 1-3 gorillas would attack the players. The closer the players got to the group the more gorillas would chase them. Once the players get far away enough though, the gorillas would return to the group and stop chasing them. This would make exploring the jungle harder and more challenging. You would be able to breed gorillas using melons. Gorillas would drop 1-2 melons, and some gorilla fur, which you could turn into leather or string.