The firefly squid is a small bioluminescent squid found in the waters off the coast of Japan. It is known for its ability to produce light, which it uses for communication and attracting prey. These squids typically grow to about 7 centimeters in length and are most visible during their spawning season in spring. Firefly squids have a unique blue-green glow, which comes from specialized cells called photophores. They are often seen in large numbers, creating a stunning display in the ocean. This phenomenon attracts tourists and researchers alike, making the firefly squid an important species for both ecological and economic reasons.