Usamaru) directed the first 10-episode series, which premiered in August 2018. Aoki directed the two new episodes that premiered in March 2019, as well as the eight new episodes that premiered in July 2019.
The book series offers humorous introductions to surprising animal facts, such as raccoons don t really wash their food and dolphins would drown if they fell completely asleep.
Takahashi Shoten began publishing the book series in 2016, and the resulting four volumes have more than 3 million copies in circulation.
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