Science: Zoo Chimp 'Planned' Stone Attacks

A chimpanzee in a Swedish zoo has been revealed to have planned hundreds of stone attacks on visitors of the zoo. Researchers have shown Santino, a chimpanzee, would gather and store stones that he would later use as projectiles in displays of dominance. They also found that he could recognize parts of his enclosure that could be pulled apart and fashioned into further projectiles. The researchers suggest that these behaviours are a display of animals planning for future events, a behaviour which has been thus far difficult to prove.

http://news.bbc.co.uk/2/hi/science/nature/7928996.stm