They have a problem-solving capacity which biologists have experimented to show that they can store both short and long term memory. Octopuses inhabit different regions of the ocean including ocean floor, pelagic waters, and coral reefs. Octopuses are also known to be solitary creatures and only group together during mating.There are dangerous octopuses who produce venom that is deadly to humans. They are very adaptable and live in everything from small swallow pool to depth up to  2,000 m (6,600 ft). With a personality that's as complex as its appearance, this octopus is a master of disguise that can solve a maze, recognize our aquarists and jet across the exhibit in a whoosh of water. Marine invertebrates influence habitat development and structure, as well as regional to global marine chemistry and climate feed-backs. The small octopuses are common in tropical and subtropical coral reefs and tide pools of the Pacific and Indian Oceans, ranging from southern Japan to Australia. They live in all the world’s oceans but are especially abundant in warm, tropical waters. The most surprising thing is that they carry these shells around by holding with their body as they traverse the ocean floor. A bite leaves a tiny mark and may be painless, so it's possible to be unaware of the danger until respiratory distress and paralysis occur. Blue-ringed octopuses are not aggressive.Blue-ringed octopuses reach sexual maturity when they are less than a year old. They are one of the most venomous octopus species in the world.The rings of a southern blue-ringed octopus are particularly vivid when an individual is threatened or agitated.

If artificial respiration is started immediately and continued until the toxin wears off, most victims recover.During the day, the octopus crawls through coral and across the shallow seafloor, seeking to ambush prey. It can use its venom to immobilize its prey by either of two methods: 1) biting the prey and injecting the venom directly into the wound or 2) releasing a cloud of venom into the water which enters potential prey through its gills. Octopuses are also known to manipulate tools created by humans as researchers found out that they can effectively open jars to get food.

The head and its foot are in one end and functions as the front of this animal. The saliva also contains.Encounters with this reclusive creature are rare, but people have been bitten after handling or accidentally stepping on a blue-ringed octopus. Some species are so poisonous that their toxins can kill in minutes.
There is no antivenom for a blue-octopus bite, but tetrodotoxin is metabolized and excreted within a few hours.First aid treatment consists of applying pressure to the wound to slow the effects of the venom and artificial respiration once the victim stops breathing, which usually occurs within minutes of the bite. Like all octopuses, southern blue-ringed octopuses are short-lived, and females only reproduce once in their lifetime. Their diets include fish, crustaceans, mollusks, polychaete worms, scallops, crabs, prawns and other cephalopods. Octopuses are sea animals famous for their rounded bodies, bulging eyes, and eight long arms. They greatly enjoy spending their time in areas under rock cover where they can easily camouflage themselves. Octopuses also adapt to waters of different temperatures with the smaller octopus living in warmer water and the larger octopuses living in colder water. The aposematic warning display deters most predators, but the octopus piles up rocks to block the entrance to its lair as a safeguard. The interior parts of its arms have adhesive suckers that allow it grab on objects. These cephalopods are in two groups, the Incirrina and Cirrina. The incirrate octopus lacks filaments known as “cirri” while the Cirrina has an internal shell and two fins.

Find out about these and other octopus facts. There are 300 species of these animals of which all live in oceans and seas, and none live in freshwater. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. They are very adaptable and live in everything from small swallow pool to depth up to  2,000 m (6,600 ft). Octopuses vary greatly in size: the smallest, O. arborescens, is about 5 cm (2 inches) long, while the largest species may grow to 5.4 metres (18 feet) in length and have an arm span of almost 9 metres (30 feet). They are also said to have aggression and hot tempers as they attack crabs immediately when they see them. They are found in almost all the oceans of the world at different depths with a majority residing in the Arctic. Females are slightly larger than males, but the size of any octopus varies greatly depending on nutrition, temperature, and available light.The blue-ringed octopus hunts small crabs and shrimp during the day, but it will eat bivalves and small fish if it can catch them. They are able to blend into their surroundings so well that even a well-trained eye may overlook one of them if they aren’t’ careful. Like the rest of the cephalopods, an octopus is bilaterally symmetric in that its body parts are along its dorsal, ventral axis. They also have beaklike jaws that can deliver a nasty bite, and venomous saliva, used mainly for subduing prey.Octopus ink is one of nature’s most theatrical defense mechanisms, but what is it made of?Photograph by Joel Sartore, National Geographic Photo Ark,A common octopus photographed at Gulf Specimen Marine Lab and Aquarium in Panacea, Florida,https://www.nationalgeographic.com/animals/invertebrates/c/common-octopus.html. The Caribbean reef octopus inhabits many reefs and grass beds throughout the western Atlantic, Bahamas, Caribbean, and northern South America.

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