• Boneless animal with eight arms and bulb like head with the lifespan of 3-5 years which are bilaterally symmetrical with two eyes and one beak.
• They are one of the oldest animals and are evolving since 10 million years.
• There are about 300 species of octopus all around the world that are found in marine water.
• Octopus size varies in a extreme range they can be as big as 30 feet in length and as small as 2.5 cm in length - quite a large range!!!!
• They have siphon in them that helps them in respiration and locomotion.
• They have presence of famed ink which is mixture of both pigment and mucous which appears as a drak cloud in front of the predator and helps the organism to slip away therefore it is it's important defence weapon.
• They change their body color according to mood. Bordem attacks them very fast.
• An octopus 🐙 has three hearts in total

       One main (systemic heart) for        pumping the blood to the                            whole body.

• Two additional hearts to pump the blood though the gills present in the body.
• The heart of the octopus stops working while it's swimming because of its preference to crawl as swimming seems exhausting to them.
• It has blue colored blood due to presence of copper-based protein heamocyanin.
• Their suckers are strong, as it pick the weight upto 10-16 kgs,and are highly sensitive in nature that It can taste any object/thing by the means of touching by presence of suckers all over its body.
• It has high power of regeneration if loses its arm can grow back to the same with a great speed .
• They die after mating. The male dies within a month after mating while the female fast to protect their eggs and thus die of starvation that accounts for its short life span.
• Highly light sensitive animals.
• They are the highly intelligent animals they can even capy the colors and texture of the sorroundings they protects themselves from predators by camouflage.
• Octopus has nine brains that is one central brain and eight mini brains that is the raesonOctopus arms is regarded to have  mind of its own as two third of the total neuron present resides in the arms that help it's to find , kill,and eat the prey.

Blue-ringed octopuses are one of the most venomous species ,the venom is so so strong that it can kill/ paralyze human being within minutes.