Hunting or Angry? Scientists Can't Agree on Odd Octopus Behavior

A wild octopus surprised an Australian diver this week by suddenly, and quite dramatically, inflating itself with water, ballooning up like a parachute. Later, when the diver posted a video of the interaction online, she wondered whether the octopus was trying to intimidate her with its grandiose size. That's possible, marine biologists said, but they can't agree on what caused the curious behavior.