With the Bear, run for the health pack before he attacks. Every time he is away, aim for the heart. Shoot him with the rifle while he is running away. In Africa, use the pistol to kill the snakes. Use the hunters aide to find them, then shot with pistol. With the leopards, scope them first, use the rifle and then the shotgun. When crossing the heard of buffalo, conserve your bullets as you will need them later.