1) Be Patient
Sometimes nature is on its own time table and you can not speed it up or or slow it down.
2) Nature Rules
Nature always wins. There will always be photo opportunities for you each day. You will never get them all because you weren't ready or you came by 2 minutes too late. In fact, you may still be talking about an opportunity that you didn't capture that occurred 5 years ago. Look forward to the next opportunity.
3) Be There At The Right Moment And Be Prepared
If you have a camera in hand, always be prepared and ready. Plenty of opportunities are missed because of not being prepared.
4) Be Patient
Need I say more? No patience... no good photographs.
5) Understand The Language Of The Birds
Study the language of the birds (Bird Language Tab On Top) to help you identify photo opportunities.
6) Learn To See With Outdoor Eyes
Learn to see with Outdoor Eyes (Outdoor Eyes Tab On Top) to help you identify photo opportunities.
7) You Don't Have To Be Close To Large Wildlife
It's very simple. Large animals are big and they can be photographed from a farther distance away.
8) Photograph Wildlife In Normal Behavior
A photograph of an animal in normal behavior is more interesting since many people have never seen wildlife in normal behavior.
9) Try To Photograph An Unobstructed Eye
When we view a photograph of wildlife, our eyes always look straight to the eye of the animal similar to the same way we establish eye contact with another person.
10) Learn The Safety Distance From Small Wildlife
By learning the safety distance to a small animal, you will frighten less animals away.
11) Small Wildlife Appear Even Smaller
Try to photograph small animals from a low camera position to accentuate their size.
12) Learn To Photograph Wildlife On The Move
Practice photographing wildlife that is moving in your backyard or at the park.
13) Wildlife Will Continue To Remain In Baseline If Not Perceived Threatened  
All wildlife that doesn't feel threatened will continue to go about their normal wildlife ways. Learn how to stop and remain still until the wildlife considers you safe.