Watasenia scintillans, commonly known as the glowing sucker, is a species of deep-sea squid found in the waters of the North Pacific Ocean. This squid is notable for its bioluminescent properties, which allow it to emit light, helping it evade predators and attract prey. It typically inhabits depths ranging from 200 to 1,000 meters. The glowing sucker can grow up to 30 centimeters in length and has a unique appearance, characterized by its large eyes and elongated body. Its diet mainly consists of small fish and crustaceans, which it captures using its long tentacles. This species plays a vital role in the marine ecosystem as both predator and prey.