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Study: High-resolution polarisation vision in a cuttlefish (Current Biology)The squid genus Idiosepius, which contains only a handful of very small, very adorable species, have this habit of gluing themselves to seaweed, to hide from predators.Follow-up: Delving Into The Nature Of Squid Glue Many times I have stood mesmerized by an aquarium tank, wondering, as I stared into the horizontal pupils of an octopus's large, prominent eyes, if she was staring back at me -- and if so, what was she thinking?The images of the silvery, three-meter long cephalopod, looming out of the darkness nearly 1 km below the surface, were taken last July near the Ogasawara islands, 1,000 km south of Tokyo. A rare octopus from the tropics (a female argonaut octopus or paper nautilus) has surfaced in Southern California, scooped up by a fisherman off the coast near Los Angeles, marine aquarium officials said.The diminutive blue-ringed octopus (Hapalochlaena lunulata) makes its roughly 60 blue rings that cover its arms and body glow especially bright.The large eye is specifically adapted for gazing upwards, searching for shadows of fellow sea creatures against the rapidly fading sunlight, while the small eye is adapted for gazing downwards, scanning deeper, darker water for flashes of bioluminescence. Inky the octopus didn't even try to cover his tracks.
The discovery suggests that the ink and the ink-screen escape mechanism of squid have not evolved much (if at all) since the Jurassic Period.
This provides a model system to examine modes of infection and pathogenesis between animals, bacteria and their habitats.
Not only can squids and octopuses sense sound, but as it turns out, these and other cephalopods might be harmed by growing noise pollution in our oceans -- from sources such as offshore drilling, ship motors, sonar use and pile driving.
Smaller squid make up for their diminutive size, and reduced sexual status, by producing bigger sperm.
They produce the outsized sperm in a bid to thwart the chances of larger male squid rivals impregnating females.