HI
I have used most focal lengths for wildlife photos and they all have their good points and bad. The 500mm is a good choice as long as it is a fast lens. The 50-500mm is an excellent lens but is rather heavy and needs a very steady hand. The canon 100-400mmIS is a popular choice though takes a little getting used to. I have recently used a 170-500mm sigma lens which is great but not fast enough. Now I use the canon 400mm f5.6L. This is a prime lens and is VERY sharp! and very fast though lacks the versitility of a zoom but there are few times when this would be a problem.
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