I found the Houston Zoo to be lacking. The atmosphere was ok, but there was something missing. The day I went, it was EXTREMELY crowded and I could not see the animals very clearly through the crowds. However, It seems that on a relatively calm day, it would be better. I personally found the zoo to be quite small but it was ok. If you're going to go, then make sure you go on a day on which it would seem it wouldn't be that crowded. Bring some refreshments to stay hydrated as the Houston weather will burn you up in the summer. I'd be willing to give this place another chance.
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