Female octopuses do sometimes eat their mates and the female actually only reproduces once and then they wither away and die.
Octopuses are semelparous animals, which means they reproduce once and then they die.
After a female octopus lays a clutch of eggs, she quits eating and wastes away; by the time the eggs hatch, she dies.
Females octopuses often kill and eat their mates; if not, they die a few months later, too)
All squids including giant squids reproduce sexually and all squids lay eggs.
All squid lay eggs.
Some lay single eggs, others lay clusters of eggs in a large jelly-like floating mass.
Giant squid lay eggs in this way, so colossal squid probably do the same.
The eggs hatch out into tiny versions of the adult which become mature adults in one–three years.
Squid are not all that dangerous to humans although they can harm a human if need be.
Though octopuses and squid are both formidable fighters in the wild, they aren't typically dangerous to people.
That doesn't mean they're always harmless.
Some species are particularly well equipped for defending themselves against larger creatures, and they're strong enough to kill a human if they felt threatened.
Squid are pretty smart and intelligent.
It is believed that squids are slightly less intelligent than octopuses and cuttlefish; however, various species of squid are much more social and display greater social communications, etc, leading to some researchers concluding that squids are on par with dogs in terms of intelligence.
The coleoidea sub-class of the cephalopods includes the orders of cuttlefish, squid and octopuses and it is these (particularly the latter two) which are considered the most intelligent.
The modern cephalopods, a group including octopus, cuttlefish and squid, have famously complex brains, approaching that of a dog and surpassing mice and rats, at least in neuronal number.
Invertebrates, which are animals without backbones, are often considered simple and dumb, with no brains at all.
But the cousins of clams and oysters, the cephalopods (octopuses, squids, cuttlefish), have complex nervous systems and behaviors, as well as excellent vision.
A science-based report from the University of British Columbia to the Canadian Federal Government has been quoted as stating.
The cephalopods, including octopus and squid, have a remarkably well developed nervous system and may well be capable of experiencing pain and suffering.