- The sea cucumber squirts its insides out for self-defense (and then grows a new stomach).
- The cuttlefish has several self-defense techniques, including camouflage, mimicking larger fish and squirting ink to screen its get-away.
- Marine aquarium hobbyists use Krazy Glue for fragging corals. The cut branches of hard corals are glued to a live rock substrate to allow the new frag to grow out.
- The giant Pacific octopus has been known to kill sharks by using its powerful arms to break the shark’s spine.
- The tiny, blue-ringed octopus is brown or yellow in its natural state. You won’t see the blue rings until it is too late. The blue rings are visible only when it is about to attack.
