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Monster-size, deep-sea squid that use their glowing arms to blind and stun their prey have been filmed in the wild for the first time, scientists say.
The mysterious creatures were videotaped as they hunted deep in the North Pacific Ocean off southeastern Japan.
The footage shows the animals—Dana octopus squid, or Taningia danae—targeting prey with bright flashes of light emitted from their arms. (See a video of the squid attacking [at the linked site].)
The squid appear to use the tactic to illuminate and stun their victims, writes the team that made the discovery.
Other glowing signals seen from the bioluminescent species may represent a form of communication, possibly for attracting a mate, the researchers add. (See a video of the squid flashing in the darkness as it swims around dangling prey [at the linked site].)
The human-size squid were filmed at depths of 780 to 3,100 feet (240 to 940 meters) off the Ogasawara Islands during a scientific expedition led by Tsunemi Kubodera of the National Science Museum in Tokyo, Japan.
