Hi Bryan,
Just to say that I think your wildlife images are absolutely gorgeous and it matters not whether taken in a zoo or an aquarium, etc. Oftentimes harder to get a beautiful image because of the surroundings!
My comment is with respect to wildlife competitions (when defined as non-captive/baited etc) and also my personal ethics/values. I fell in love with an image of a frog seemingly holding a leaf as an umbrella to shield itself from the rain. Later I learned that many photographers stage such such shots with live critters/insects gluing them into amusing positions for the sake of photograph. I can't even look at an image of a frog anymore without thinking how it may have come about.