(not octopi octopuses is correct when referring to different species)
Blanket octopuses are a genus of pelagic (open water) octopuses that live in most tropical oceans. They get the name blanket due to the fact that the females have long webbing on their tentacles which looks like a blanket. These species exhibit extreme sexual dimorphism as the females are alot bigger than males and have the webbing, whereas males are a few centimeters long and have no webbing. This webbing is used as a defense mechanism, when a predator approaches the female she unveils her webbing making her look alot bigger. They also have the Badass property of being immune to the Portuguese man o war’s toxin and actually rip off their tentacles and use them for defensive purposes.
Image 1 Source, Image 2 Source.