What is Octopus?
{{italictitle}} {{Taxobox | name = ''Octopus'' | image = Octopus2.jpg | image_width= 250px | image_caption= ''Octopus vulgaris'', the common octopus | regnum = [[Animal]]ia | phylum = [[Mollusk|Mollusca]] | classis= [[Cephalopod]]a | subclassis = [[Coleoidea]] | superordo = [[Octopodiformes]] | ordo = [[Octopoda]] | subordo = Incirrina | familia = Octopodidae | genus = '''''Octopus'''''}} [[File:Octopus greece.jpg|thumb|right|250px|Octopus in [[camouflage]]]] [[File:Moving Octopus Vulgaris 2005-01-14.ogv|thumb|right|250px|Moving ''Octopus vulgaris'']] '''''Octopus''''' <ref>The plural of ''Octopus'' is usually ''octopuses''. For members of the order Octopoda in general, 'octopods' is the term used. ([[Ancient Greek|Greek]]: okto = eight; podes = feet).</ref> is a [[genus]] of [[cephalopod]] [[mollusc]] in the [[Order (biology)|order]] [[Octopoda]]. The genus is quite typical of most octopods. They have two, large eyes and eight limbs with suckers. They have a hard beak, with the mouth at the center point of the arms. Octopods have no internal or external skeleton, allowing them to squeeze through tight places and hide. Many stays in cracks between rocks or corals when they are not hunting. They are [[intelligent]] [[predator]]s with a taste for [[crab]]s. Octopuses have three hearts. Two pump blood to the gills, while the third pumps it to the rest of the body.<ref>{{Cite web|date=2020-02-29|title=Why Do Octopuses Have Three Hearts?|url=https://www.scienceabc.com/nature/animals/why-do-octopuses-have-three-hearts.html|access-date=2024-08-16|website=ScienceABC|language=en-US}}</ref> Octopods inhabit many regions of the ocean, especially [[coral reef]]s. For defense against predators, they hide, flee quickly, expel ink, or use colour-changing [[camouflage]]. They live rather short lives. An octopus trails its eight arms behind it as it swims. All octopods are [[Venom (poison)|venomous]], but only the small blue-ringed octopus is known to be deadly to humans.<ref>[http://uninews.unimelb.edu.au/view.php?article