
thumb|240px|right|Aosaginohi from Toriyama Sekien's [[Konjaku Gazu Zoku Hyakki (1779) ]] right|thumb|240px|Goi no hikari from Tōsanjin's Ehon Hyaku Monogatari|Ehon hyaku monogatari ([[1841) illustrated by ]]
thumb|240px|right|Aosaginohi from Toriyama Sekien's [[Konjaku Gazu Zoku Hyakki (1779) ]] right|thumb|240px|Goi no hikari from Tōsanjin's Ehon Hyaku Monogatari|Ehon hyaku monogatari ([[1841) illustrated by ]]
', or ' (, "blue heron fire") is a will-o'-the-wisp type phenomenon in the night, a ball of flame or strange glowing light (), explained as people mistaking the heron's glittering wings and glowing eyes. The in modern taxonomy refers to the Eurasian grey heron.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).