Coconut Octopus: This species has been reported to show bipedal locomotion, or "stilt-walking". This involves rolling two legs to walk while the other six legs are used to mimic the appearance of a floating coconut. They have also been bserved using tools for concealment and defense by gathering available debris to create a shelter. Researchers have filmed this species collecting coconut half-shells from the sea floor, that had been discarded by humans. They were then carried up to 66 ft and arranged around the body of the octopus to form a spherical hiding place similar to a clam-shell.
Blanket Octopus: Blanket octopuses are immune to the venomous Portuguese man o' war, whose tentacles the male and immature females rip off and use for offensive and defensive purposes. Like many other octopuses, the blanket octopus uses ink to intimidate potential predators. Also, when threatened, the female unfurls her large net-like membranes that spread out and billow in the water, greatly increasing her apparent size.