Detatched octopus arms show awareness, react to danger

From the article:

It’s further evidence that octopus intelligence is unlike anything we’ve ever seen. Their arms continue to remain alert, reacting to pain, long after they have been removed from the body of the octopus. This isn’t just post-mortem twitching — the tentacles are aware of their environment, and responding to danger.

(shudder)

http://io9.com/detatched-octopus-arms-show-independent-awareness-1209041248