What does the fact that there is an entry for fireflies in kitamaru kigin's manual for poetry suggest about the roles of animals in Japanese poetry?

The presence of an entry for fireflies in Kitamaru Kigin's manual for poetry suggests that animals play an important role in Japanese poetry as symbols of nature’s beauty and transient moments. Fireflies are often associated with themes of impermanence and evoke a sense of nostalgia, making them popular subjects for poets seeking to capture poignant emotions in their work.