In 1832, when Hokusai made this print, frogs and other amphibians were considered insects in Japan.

Convolvulus and Tree-frog. Ukiyo-e. Hokusai, Katsushika. Colour print from woodblocks, 1832.

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'Animal Race' by Kawanabe Kyōsai (d.1889) scanned (by my mate) from *The Studio* magazine 1898

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