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A CP filter will cut glare on water or shiny objects. This isn't really a big deal when shooting wildlife. It would also cut down the amount of light entering your lens, slowing your shutter speed down and that's undesirable for wildlife, especially with a big telephoto.
The ND filter won't cut glare at all; it will reduce the amount of light entering the lens slowing down shutter speed.
Some would say you should put a protective/UV filter on all your lenses, but that's debatable.
Canon EOS Rebel XSi; EF 100mm f/2.8 Macro USM; EF 50mm f/1.4 USM; and more.
Thank you all. I will get a protective/UV filter, just because it makes me feel better to have it!! The lens does have a hood and I may get the CP because I live in FL and will be taking photos of birds on the beach. Again thanks!!