Octopolis

In Australia an unusual society of octopuses has congregated in Jervis Bay, which observers have dubbed "Octopolis." 

Octopuses are normally relatively solitary, so this tendency to group together is not fully understood. 

Marine biologist Peter Godfrey-Smith reports that he's noticed a lot of "ornery" behavior that resembles fighting, boxing, bullying, and even shooting shell projectiles underwater. He's not completely sure if this is just territorial squabbling or something else. 

More at Earth Touch Network.