They mainly consume mollusks and crustaceans. They are also known to eat various types of fish and snails. Nearly all octopuses are predatory; bottom-dwelling octopuses eat mainly crustaceans, polychaete worms, and other molluscs such as whelks and clams; open-ocean octopuses eat mainly prawns, fish and other cephalopods. Other octopus species live in deep, dark waters, and rise from below at dawn and dusk to search for food. They perform their famous backward swim by blasting water through a muscular tube on their body called a siphon. They also crawl along the ocean's floor, tucking their arms into small openings to search for food. Giant Pacific octopuses can consume 2–4% and gain 1–2% of their body weight each day. Three defensive mechanisms are typical of octopuses: ink sacs, camouflage, and autotomising limbs. Most octopuses can eject a thick blackish ink in a large cloud to aid in escaping from predators. They also have specialized skin cells, called chromatophores, for both color changing and light reflection and refraction.
Explanation: Currently, there is no animal with that amount of hearts. But Barosaurus was a huge dinosaur which needed 8 hearts to circulate blood upto it's head. Now, the maximum number of hearts is 3 and they belong to the Octopus.
Octopus bites can cause bleeding and swelling in people, but only the venom of the blue-ringed octopus (Hapalochlaena lunulata) is known to be deadly to humans. Octopuses are curious creatures and generally not aggressive toward people.
Octopuses can sometimes suffer from autophagy, or self-cannibalism. That is what is described as "eating its own arms. " This is caused by stress. A stressed animal is not a healthy animal and is open to infection.
The arm becomes a decoy that can give the octopus time to get away. The arm becomes a decoy that can give the octopus time to get away. It will continue to move until the cells all die and it can't move any longer. When the main brain of an octopus is killed the arms will react the same way.
Octopus is not a fish, it is a mollusk.
An octopus pooping. How does an octopus poop? An octopus expels waste through it's siphon located on the side of its mantle - the siphon is also responsible for shooting jets of water to propel itself forward and dispersing ink to protect against predators.
Octopus is commonly confused with calamari, though both are surprisingly different in taste (when served raw) and cooking methods. Many people think calamari dishes are made from octopus, when in fact calamari is actually made from a type of squid.
Squid and octopus are both a good source of zinc, manganese, copper, selenium, riboflavin, and vitamin B12. Squid and octopus both contain good sources of vitamins and minerals our bodies need. Octopus is low in calories, lean, and is a great way to get protein into your diet without consuming a lot of fat.
All octopi have venom, but few are fatally dangerous. The greater blue-ringed octopus, however, is considered to be one of the most venomous animals known; the venom of one is enough to kill ten grown men. It uses the neurotoxin tetrodotoxin, which quickly causes respiratory arrest.
Although you might only know about blue ringed octopus genus (Hapalochlaena) being venomous, all octopus actually have venom, even though most are not lethal to humans. There aren't many accounts of humans being hurt by octopuses – they tend to avoid humans, and many attacks haven't been verified.
The giant Pacific octopus has three hearts, nine brains and blue blood, making reality stranger than fiction. A central brain controls the nervous system. In addition, there is a small brain in each of their eight arms — a cluster of nerve cells that biologists say controls movement. Two hearts pump blood to the gills.
In order to kill an octopus quickly and safely, it is recommended to put a finger into the head (opening is on the back of the head, behind the eyes). Now you turn the animal's hat over in a fast movement. If you do it correctly, the octopus quickly changes from an angry red to a brown / white.
It only requires them to spend less than a minute on land to get from tidal pool to tidal pool. In short, an octopus could survive out of the water for several minutes. The longer it is out of the water, the greater the risk of it suffering damage to its gills.
Male octopuses have a big problem: female octopuses. Each male wants to mate and pass on his genes to a new generation. The trouble is, the female is often larger and hungrier than he is, so there is a constant risk that, instead of mating, the female will strangle him and eat him.