they use there special ink to defend them selves
By camouflage . Blending into the same color as its surrounding makes it difficult for prey to seek out the octopus
baned
It hides in the sand or campfloges it'self to look like a octopus
it stinks ink
A octopus doesn't make a shelter it make itself at home in human waste and caves.
they have no bones
An octupus sprays black ink so the prey cannot see then the octopus runs away...
An octopus can pretty much squeeze itself into any nook or cranny in rocks and coral for protection or shelter.
Because it is faster to hide from predators
octopus
as it protects itself from predators and escapes from them.
a siphon