In an area of Indonesia where the ocean floor is littered with empty coconut shells, a species of octopus has been filmed "walking" on two of its eight tentacles. The remaining six tentacles are
wrapped around its body. Scientists suspect that, with its tentacles arranged this way, the octopus
resembles a rolling coconut. Local predators, including sharks, seem not to notice the octopus as
often when it behaves in this manner. This unique method of locomotion has been utilized by
successive generations of octopi through -