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Unable to defend themselves, octopuses often fall prey to predators. [76] This makes most octopuses effectively semelparous . The larger Pacific striped octopus (LPSO) is an exception, as it can reproduce repeatedly over a life of around two years.
Opisthoteuthidae are a group of octopuses characterized by a web of skin in between their arms. They broad U-shaped shell that support muscles for a pair of small fins on the mantle, these fins are far less developed than other families in Cirrina and essentially only act as stabilizers when the animal swims (using a medusoid motion of the arms and webbing). [1]
Many prey animals, and to defend against seed predation also seeds of plants, [55] make use of poisonous chemicals for self-defence. [ 51 ] [ 56 ] These may be concentrated in surface structures such as spines or glands, giving an attacker a taste of the chemicals before it actually bites or swallows the prey animal: many toxins are bitter ...
Octopuses taste by touching objects with their tentacles. Here's a sampling of the coolest animal discoveries from 2020. 22 discoveries this year changed our understanding of how animals ...
Each species of cephalopod produces slightly differently coloured inks; generally, octopuses produce black ink, squid ink is blue-black, and cuttlefish ink is a shade of brown. A number of other aquatic molluscs have similar responses to attack, including the gastropod clade known as sea hares .
A new study found that some members of an octopus species hunt cooperatively in groups with fish. Video shows octopuses punching their companion fish to keep them on task and contributing to the hunt.
It’s extremely rare in the animal world for an animal to throw things, and has only been seen in a few species such as non-human primates and elephants. The gloomy octopus lives deep in the sea ...
Both octopuses and squids have mantles (referenced above) which function towards respiration and locomotion in the form of jetting. The composition of these mantles differs between the two families, however. In octopuses, the mantle is made up of three muscle types: longitudinal, radial, and circular.