A free app for Android, by War Action Fun Studios.

Epic Animal Battle Simulator is a free action game with plenty of missions, based on real wildlife events. It lets you play with different animals in the forest, like lions, elephants, wolves, bears, and more. Your mission is to survive in the wilderness by hunting other animals and controlling the forests, deserts, and plateaus.

You can find missions on the map, or in the menu. Each mission has a time limit, and when you complete the mission, you will receive a reward. 

The gameplay is easy to understand, and it has gold and money to spend. You will be able to upgrade your animals and weapons.