Millions of squids come together to fertilize and to drop their eggs in the Toyama Bay in Japan for their reproduction once a year which is around March to June. Besides reproducing, the big reunion of these squids is a one big light show which attracts thousands of tourists.

This firefly squid has hundreds of bioluminescent photophores that cover the body which gives a blue light. It can make different light show patterns with the photophores to communicate with others, to distract a predator or even lure prey such as little fishes. It is scientifically known as Watasenia scintillans and it belongs to the class of Cephalopoda. Just as the name given to this squid, it is related to the firefly which gives out the same light as bioluminescence. This firefly squid can be found in the Western Pacific ocean where it can live on depths of 600 to 1200 feet.

The eyes of a firefly squid have 3 pigments along with a double layered retina back in their eye. This helps the firefly squid to distinguish ambient light and bioluminescence light. This way they can see if the light is produced by other firefly squids or by predators. A big difference between other squids is that it's believed that the firefly squid is the only one with color vision.

Once the firefly squids have reached their one year life-cycle, they die and wash up on the shore. This event is very important for other sea creatures and sea birds that enjoy eating the dead bodies of the firefly squid.

Firefly squid can be seen starting from 0:09. Enjoy (: