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Giant Pacific octopuses are able to recognise individual humans [66] and common octopuses can recognise other octopus individuals for at least one day. [ 67 ] In a study on social learning, common octopuses (observers) were allowed to watch other octopuses (demonstrators) select one of two objects that differed only in colour.
Octopuses have a food conversion efficiency greater than that of chickens, making octopus aquaculture a possibility. [161] Octopuses compete with human fisheries targeting other species, and even rob traps and nets for their catch; they may, themselves, be caught as bycatch if they cannot get away. [162]
While octopuses generally avoid humans, attacks have occasionally been verified. For example, a 240-centimeter (8-foot) Pacific octopus, said to be nearly perfectly camouflaged, approached a diver and attempted to wrap itself around the diver and his camera. Another diver recorded the encounter on video.
Most octopuses mimic select structures in their field of view rather than becoming a composite color of their full background. [ 41 ] Evidence of original coloration has been detected in cephalopod fossils dating as far back as the Silurian ; these orthoconic individuals bore concentric stripes, which are thought to have served as camouflage ...
The creatures are known as dumbo octopuses because of their “large” fins. ‘Cutest octopus in the world’ seen for the first time in Southeast Pacific. See video
Certain squid species possess a tail, which is an extension of the body past the fins. [5] The tail may be said to start at "the point where a hypothetical line, continuous with the broad posterior edge of the fin, crosses the midline of the body". [ 1 ]
Octopuses also have strong beaks that they could bite a human with. With the exception of the blue-ringed octopus all octopus bite with their large beaks and inject venom, but the venom is not fatal.
Cephalopods, as active marine predators, possess sensory organs specialized for use in aquatic conditions. [1] They have a camera-type eye which consists of an iris, a circular lens, vitreous cavity (eye gel), pigment cells, and photoreceptor cells that translate light from the light-sensitive retina into nerve signals which travel along the optic nerve to the brain. [2]