
Underwater video cameras have recorded over 100 instances of gloomy octopuses hurling silt and shells at one another in Jervis Bay, Australia.
Source: Gizmodo – Octopuses Caught on Camera Throwing Shells at Each Other

Underwater video cameras have recorded over 100 instances of gloomy octopuses hurling silt and shells at one another in Jervis Bay, Australia.
Source: Gizmodo – Octopuses Caught on Camera Throwing Shells at Each Other