This is about taking back to their natural environment a group of penguins that had been taken away from their home a while ago to show them as an exhibition in a Zoo. The process of this shows how changing their habitat affected them in a bad way, for example, one of them was eating sand thinking it was the artificial snow he used to eat in the Zoo. Due to this and some other factors they required special treatment to help them get back to their natural home.
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I think this quote is trying to say you need to be yourself and not follow the crowd. There are so many people who act the same because that’s what’s "expected" in society. If you continue with the flow and don’t go against it, you will end up being like all the rest without even realizing it. Hope that helped
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"c. She was not interested in becoming part of the popular group" is how Millicent was different a year or two before the story, since this is a major character development.