Zoo Chimp stashes stones with intent to throw @ onlookers

....seems like we're finally awake enough to understand that many animals may actually 'think ahead.' Perhaps, they also have an emotional life, feel pain, remorse and joy.....so, how can we treat them the way we do? Where is the line?

"Keepers at Furuvik Zoo found that the chimp collected and stored stones that he would later use as missiles.

Further, the chimp learned to recognise how and when parts of his concrete enclosure could be pulled apart to fashion further projectiles.

The findings are reported in the journal Current Biology."