Question

what is the speciality of octopus?

Answer 1

All varieties of octopus are venomous. Fortunately, only a few species have enough venom to injure or kill a human being. One of these is the blueringed octopus, which is responsible for at least two confirmed deaths. Octopi inject their venom using a tough beak-like mouth that sticks out of the side of their head

Answer 2

octopus had 8 arms
it has a brain which is the central brain
each arm has its own brain
each arm can think and move on its own
so, it has 9 brains on total

it has blue colour blood

it has 3 hearts