To survive in such conditions, invertebrate Octopuses have evolved with Copper-based blood (instead of iron-based blood) called Hemocyanin, which turns its blood blue. Octopuses are deep ocean creatures, where water temperature is very low and not much oxygen is available. Notably, the systemic heart is inactive when the octopus swims – reason why it tires quickly and prefers to crawl. While the systemic heart circulates blood round the body, the two other branchial hearts pump the blood through each of its two gills. the blood formed remains inside the blood vessels. Octopus has a closed circulatory system, i.e. Not just the Giant Pacific Octopus, even an ordinary Octopus has 3 Hearts and Blue color Blood. Octopuses are fascinating, mysterious and creepy creatures of the sea. As explained below, the claim is partially hoax. In fact, the message is often shared online as an unbelievable fact. The message states the largest octopus species in the world, the Giant Pacific Octopus has 3 Hearts 9 Brains Blue Blood. Some octopus species only live for six months, while the longest living species have a lifespan of five years.The largest octopus species in the world, the giant Pacific octopus, has three hearts, nine brains, and blue blood. After mating, the male octopus dies, and once the eggs hatch, the female dies as well. They grow surprisingly quickly, and their lifespans are short. They can also be trained to differentiate between shapes and designs. They are known to solve labyrinth puzzles, which proves they have a memory system. They are extremely intelligent, to an extent we're still not familiar with completely. Octopuses are predatory animals, and they eat a lot of smaller creatures that inhabit the deep sea. Most octopus species live a solitary life except for the times when they are mating. While octopuses are venomous, they are not deadly to humans, save for the blue-ringed octopus. They can use the discharge of ink, camouflage, or run away very quickly and hide. They exhibit different strategies to defend themselves from predators. There are no species of octopus that are living in freshwater regions. Some octopuses inhabit the abyssal depths of the ocean, while others can be found in the intertidal area. Some of those include coral reefs and the seabed. Octopuses can be found in very different parts of the ocean. Octopuses have three hearts, one that circulates the blood throughout the entire body and two, which drive blood through the two gills. They also have an intricate nervous system and exceptional sight. While swimming, their eight limbs trail behind them, and they use their siphon to expel a jet of water that propels them forward.
![octopus hearts octopus hearts](https://i.pinimg.com/originals/f5/12/23/f51223fbf0e37bd2380168d47333a654.jpg)
Octopuses have a soft body that can change shape allowing passage through small gaps underwater.
![octopus hearts octopus hearts](https://indianapublicmedia.org/wpimages/amomentofscience/2016/03/amos_octopus.jpg)
Tentacle signifies appendages used for feeding, and the octopus doesn't use its limbs to feed. The term 'tentacles' is often used when talking about octopuses. It shares similar characteristics with the other cephalopods, meaning it has two eyes and a beak, and its mouth is placed at the center of its eight limbs. It is grouped with cuttlefish, squids, and nautiloids in the class Cephalopoda. The octopus is a mollusk with eight limbs and a soft body. Some octopuses would continually release their toys into the water stream and then catch them around the aquarium. One example that shows how surprisingly intelligent these marine animals can be observed is them playing a game. It is considered one of the largest, fastest, and most intelligent invertebrates.
![octopus hearts octopus hearts](https://images-na.ssl-images-amazon.com/images/I/91-tUz8SQRL.jpg)
It also has intricately built eyes that see very well. The octopus has three hearts - two hearts that drive blood through the gills, and one drives it through the bloodstream of the rest of the body.