Wildlife can be very difficult to capture. To capture something in its natural habitat takes a lot of time. You must be patient and wait for them to come to you so they are not scared off or attack. I find many times the longer you wait and let them come to you the more natural action of the animal you will see.
According to Photosbykev.com the greatest tip of all is wake up early and move slow. If you move to fast the animal could be gone before you were able to capture anything. If you move slow you also have tendency to catch more of the enviroment around you. Getting up early is also a good tip, many animals move and eat early in the mornings rather then throughout the day. There are many sites on the internet that provide good tips and hints while you are catupring wildlife.