The Shedd shared video showing Wellington the rockhopper penguin wandering through the closed aquarium and visiting other animals.
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The Shedd said Wellington, "seemed most interested by several of the freshwater fish species, including the red-bellied piranhas and the black-barred silver dollars. Those same fish seemed equally interested in Wellington, meaning the penguins aren't the only animals receiving enrichment from these pop-up field trips."
The Shedd Aquarium is closed until March 29.