There is also a description in an encyclopedia compiled in the Edo period "Wakan-sansai-zue" that reads that the appearance of a young night heron flying in the air is just like a fire and is especially seen brightly on a moonlight night.
江戸時代の百科事典『和漢三才図会』にも、ゴイサギが空を飛ぶ姿は火のようであり、特に月夜には明るく見えるとの記述がある。