The Sumida Aquarium, located in Tokyo, is facing a unique problem since it shut its doors to public in the beginning of March. Its animals have become habituated to a human-free environment, as they have been largely absent for the past two months. A spokesman of the aquarium wrote on Twitter that the "unprecedented situation" was leading to some unexpected downsides. He said, "Creatures in the aquarium don't see humans except keepers and they have started forgetting about humans. Garden eels, in particular, disappear into the sand and hide every time the keepers pass by." This has led to difficulties for the keepers trying to keep a track of the health of these animals.

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