Vampire squid

The vampire squid lives in the deep, dark ocean.

It has a dark cloak made of skin. This skin connects its eight arms.

It has very large eyes. These eyes help it see in the dark.

It can also make its own light.

The squid uses light to stay safe. It can flash bright lights. This can confuse big animals that want to eat it.

It does not eat blood. Instead, it eats tiny bits of food. It uses two long threads to catch its meals.

This animal is a very special survivor. It lives where there is very little air in the water.

The vampire squid lives in the deep, dark ocean.

Its name comes from its dark color and cloak-like skin. This skin connects its eight arms.

These squids live in a special place. They stay in the oxygen minimum zone. This is a part of the ocean with very little oxygen. Most animals cannot live there. The vampire squid can! It has blue blood. This blood helps it carry oxygen through its body very well.

The vampire squid has very large eyes. They are the largest eyes in the animal kingdom for its size. It also has light-producing organs called photophores. These organs can make bright flashes of light.

If a predator comes near, the squid can hide. It curls its arms around its body. This is called the pumpkin posture. It can also let out a cloud of glowing mucus. This light can dazzle a predator.

To eat, it uses two long filaments. These are like thin threads. They help the squid catch tiny bits of food falling through the water.

The vampire squid is a strange animal from the deep sea.

Its scientific name is Vampyroteuthis infernalis. This name means vampire squid from hell. The name comes from its dark color and its cloak-like skin. It does not actually drink blood like a vampire. Instead, it eats tiny bits of food called detritus. These squids live in the deep, dark parts of the ocean. They stay in areas called the oxygen minimum zone. This is a place with very little oxygen for breathing.

Living with so little oxygen is a hard job. The vampire squid has a special way it works. It has blue blood containing a substance called hemocyanin. This helps it carry oxygen through its body very well. The squid also has gills with a large surface area. Its body is soft and filled with ammonium-rich tissues. This helps it stay floating in the water without much effort. It has very large eyes to see in the dark. These eyes are the largest in the animal kingdom for its size.

Scientists first found these creatures during the Valdivia Expedition. This trip took place between 1898 and 1899. A scientist named Carl Chun led the group. He wanted to see if life lived in the deep sea. He first described the animal as an octopus in 1903. Later, researchers realized it belonged to its own special group. This group is called Vampyromorphida. It is the only living member of this group left today.

These squids have many interesting parts. They have eight arms with a skin webbing between them. This webbing looks like a dark cloak. The arms have rows of fleshy spines called cirri.

They also have two long filaments to catch food. These filaments are tucked away in pouches. The squid is covered in light-producing organs called photophores. These organs can make bright flashes of light. Some flashes can last for several minutes. This light can help the squid hide or scare predators.

If a predator attacks, the squid uses clever tricks. It can curl its arms into a shape called the pumpkin posture. This makes the animal look much larger. It can also shoot out a cloud of glowing mucus. This sticky, blue light can dazzle a hungry fish. This is sometimes called the burglar alarm effect. This light makes the predator easy for other animals to see. This gives the squid a chance to swim away safely.

The vampire squid (*Vampyroteuthis infernalis*) is a unique cephalopod found in the deep, temperate, and tropical oceans. Its name translates to "vampire squid from hell," a title inspired by its dark color and cloak-like skin. Despite its name, it does not feed on blood. Instead, it is a detritivore, meaning it eats organic debris falling through the water. This animal is a phylogenetic relict, which means it is the only living member of its entire order, Vampyromorphida.

This creature thrives in a very difficult habitat called the oxygen minimum zone (OMZ). In these regions, oxygen levels can drop as low as 3% saturation. Most complex animals cannot survive such low oxygen, but the vampire squid has evolved special biological tools. It uses blue blood containing hemocyanin, a protein that binds and transports oxygen more efficiently than in other cephalopods. Additionally, its gills have an especially large surface area to capture what little oxygen is available. To save energy, it maintains a very low mass-specific metabolic rate.

The anatomy of the vampire squid is quite distinct from other cephalopods. It possesses eight arms connected by a web of skin that looks like a cloak. Along these arms are fleshy spines called cirri. Unlike true squids, it has two long, retractile filaments located between the first two pairs of arms. These filaments are used to sense and capture food. Its eyes are proportionately the largest in the animal kingdom, which helps it detect light in the aphotic, or lightless, depths.

To protect itself, the vampire squid uses bioluminescence, which is the production of light by living organisms. It is covered in light-producing organs called photophores. These organs can create bright flashes that last from a fraction of a second to several minutes. If a predator attacks, the squid can perform a "pumpkin" or "pineapple" posture. It curls its arms inward to look larger and more intimidating. It can also eject a sticky cloud of glowing blue mucus. This creates a "burglar alarm effect," making the predator visible to even larger hunters.

History shows how much we have learned about this species through exploration. The vampire squid was first discovered during the Valdivia Expedition from 1898 to 1899. This expedition was led by the German zoologist Carl Chun. Chun wanted to prove that life existed in the deep sea, challenging the "Abyssus theory" which suggested the deep was lifeless. In 1903, Chun originally described the creature as an octopus. Later, scientists realized it belonged to its own unique order, Vampyromorphida.

Feeding habits for the vampire squid are quite specialized. It uses its two sensory filaments to collect detritus, such as remains of gelatinous zooplankton and crustacean parts. It even uses a unique luring method by agitating bioluminescent protists to attract prey. While it is mostly a sedentary feeder, researchers have found fish bones and scales in the stomachs of mature adults. This suggests they can also be opportunistic hunters of larger prey.

Understanding the vampire squid helps scientists study how life adapts to extreme environments. Its relationship to other animals is a subject of ongoing research. While it shares eight webbed arms with cirrate octopods, it differs in how its suckers and cirri are arranged. Genetic studies show that the Vampyromorphida were the first group of Octopodiformes to diverge evolutionarily. This makes the vampire squid a vital link in understanding the history and evolution of all cephalopods.