Thanks for the clarification on monster sources.
I ended up switching out the improved elemental wildshape feat I had taken. While I qualified for all the listed prereqs I failed to originally notice the epic descriptor which adds a hidden prereq I did not qualify for.
(Epic is ECL 21 and not 20 right?)
I took sudden empower (complete arcane) instead.
Another quick question. I took multiattack which has a prereq of at least three natural attacks. Since I can wildshape into bears and such which this would apply to is this valid?