These little known, strange and fragile creatures live over 1,000 feet beneath the ocean surface, and are thought to be at risk as the ocean turns to acid.
"As the caterpillar grows it develops the skull pattern as a defence strategy to shock potential predators," conservation officer Mick Andren told Newsweek.
To mark Halloween, Ring has shared footage of some of the most terrifying critters ever spotted on a doorbell camera, and it doesn t make for relaxing viewing.