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Tony & Chelsea Northrup give you their tips for both beginner and advanced wildlife photographers. Here's an index:

0:00 Introduction
0:25 Targeting
Finding the subject in the viewfinder)
1:28 Prefocusing
Focusing at a similar distance to where your subject is
2:29 Camera Settings
Use Shutter Priority and auto ISO. Adjust your shutter speed depending on whether the subject is still or moving. Try to reduce your shutter speed to show a little desired motion.
4:04 Exposure Compensation
Auto Exposure will often under-expose or over-expose your photos. Know how to use exposure compensation to save yourself from losing data!
4:47 Shoot raw
Raw images have extra data in the highlights and shadows. Because wildlife photography is often high-contrast, this can save your pictures with post processing!
4:58 Photograph everything
Practice BEFORE you get lucky and find that amazing shot! Photograph everything, pets, seagulls - whatever you can find!
5:38 Keep your shadow in front of you
Animals usually look best front-lit, so keep the sun to your back. That means your shadow should be in front of you!
7:12 Be still
Don't go chasing after animals (unless you want photos of their backsides). Pick a spot and be quiet and still. Wait for them to come to you!
7:38 Be consistent
Some days are better than others... but if you go out every day, you'll definitely have a few good days!