With the Bear, run for the health pack before he attacks. Everytime he is away, aim for the heart. I killed him only using the rifle, but shot it lots, including while he was running away. In Africa, use mostly the pistle to kill the snakes. Use the hunters aide to find them, then shot with pistol. With the leopards, scope them first, rifle then shotgun. When crossing the heard of buffalo, do not waste bullets here. will need lots soon.