The scariest octopus is the Blue Ringed Octopus.
Although the blue ringed octopus is only the size of a golf ball, a blue ringed octopus also holds enough tetrodotoxin to kill as many as 26 adult humans.
The bite of a blue ringed octopus is also completely painless and people who are bitten by the blue ringed octopus usually don't realize they are envenomated until the person suddenly stops breathing and even becomes paralyzed completely.
An octopus eats crabs, lobsters, clams, shrimp, mussels, small fish and snails and some larger species of octopuses occasionally eat sharks.
Octopuses are strictly carnivorous and hunt and eat a variety of marine life.
Octopuses pounce on their prey and wrap their prey in their webbed arms and use the suction cups to secure the prey to eat.
Then the octopus, injects a paralyzing toxin into their prey to subdue their prey and instead of teeth, octopuses use a sharp, parrot like beak to crush shells and tear flesh into bite sized pieces.
And for hard shelled mollusks, octopuses will often also drill a hole in the shell to inject the venom directly.
Octopuses can also hear, although octopuses don't have any ears.
While octopuses don't have ears, octopuses can still hear, by detecting sound vibrations using special organs that are located behind the octopuses eyes.
The special organs that octopuses have behind their eyes that allows them to detect sound vibrations are called statocysts.
The statocysts that octopuses have that allow them to detect sound vibrations are fluid filled sacs that are lined with sensory hairs that sense the movement of water particles.
Because octopuses lack traditional ears like humans and other animals, an octopuses auditory experience is different from our hearing.
An octopuses hearing is limited to lower frequencies, which often range from between 400 Hz and 1000 Hz, with the best sensitivity occurring around 600 Hz.
And instead of processing acoustic pressure waves, like humans do, octopuses instead essentially feel the acoustic particle motion and vibrations through their statocysts and bodies.
An octopuses hearing is also considered one of the octopuses weaker senses.
Although it's also believed to be vital for the octopus to detect low frequency rumbles of any approaching predators like eels, sharks and marine mammals or even for eavesdropping on nearby prey.
Octopuses can also recognize humans and individual humans.
Research also demonstrates that octopuses, which are very highly intelligent invertebrates can also tell people apart, even when the people are wearing identical clothing or uniforms.
Octopuses can also remember past interactions and sometimes even develop distinct favorites and nemeses.
Octopuses also have 2 biological sexes, which are male and female as they do reproduce sexually and distinguishing between the sexes of the octopuses comes down to looking for a single and unique reproductive organ.
Male octopuses don't have a penis, but instead male octopuses have a specialized mating arm that is called a hectocotylus, which is often located on the third right arm.
The arm lacks suction cups at the tip and is used to deliver sperm packets also known as spermatophores directly into the female octopuses mantle cavity.
Female octopuses don't have the specialized arm and all of the 8 arms of the octopus are identical.
Female octopuses also have a mantle cavity that is used for receiving the male octopuses sperm packets, which they often also store to fertilize their eggs at a later time.
In some species of octopuses, like the blanket octopus, male and female octopuses are so drastically different that they also exhibit some of the most extreme sexual dimorphism in the animal kingdom.
Female blanket octopuses can also grow up to 6 feet long and male blanket octopuses average just 1 inch long.