Penguins walk in an aquarium(水族馆) in Chicago, the USA. There are no visitors. Officials(官员) close the aquarium because of the COVID-19. The penguins walk around. They watch the fishes.
Workers let the penguins walk freely in the aquarium. Workers say that it is important for the penguins. They can do as they like. They are happy and active. Other animals are sometimes free, too. It is common in the aquarium. The workers want all animals to be happy.
Workers make a video of the penguins. Many people watch the penguins on the Internet. People like the video a lot. They want more videos with more animals.
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