The concept is very cool and they are serious about trying to preserve the authenticity of the ecosystems. They even have the birds reproduce (very challenging in caprtivity) to replenish the population. You can see natural nests, animals behaving pretty close to how they would in the wild, and lots of interesting flora.
The cons are:
1. It gets very crowded. We waited in a very long line and some areas had a flow of traffic that made it difficult to see what was going on; and
2. Some ecosystems do not feature much wildlife. I know, it's very difficult to maintain animals in man-made ecosystems, especially while trying to be true to conditions, but it would be more fun with more animals.
I recommend this for families, especially with smaller children. I don't so much reommend it for people who have been to a lot of similar museums.
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