The Glass Octopus (Vitreledonella richardi) is a transparent almost colorless cephalopod and is often compared to a living glass sculpture. Their eyes are rectangular in shape and their translucent skin serves as a defense mechanism against possible predators. The Glass Octopus can be found throughout the world in almost all tropical and subtropical waters. They tend to stay in the water depths of between 656 ft (200 m) to 13,123 ft (4,000 m). This species of octopus is rarely encountered by humans thus it is one of the least studied cephalopods. It is assumed their diet is made up of fish and small crustaceans.