The Glass Octopus
By: David Romero
The Glass Octopus reaches 4.3 in. in mantle length and 18 in when you include the tentacles. They live in tropical and subtropical waters across the world at depths between 540 and 5,550 feet. This is the Twilight Zone, where the Sun's light is reduced to a blue haze. Their transparent appearance helps them survive by casting the least amount of shadow down where predators lurk. Because these octopuses are so rarely captured—physically or on film—little is known about their lifecycles and their habits.
Cephalopod video: Vitreledonella richardi
PS. Sorry about the bad quality of the videos those were the only ones i found on youtube.