More Projectiles

A zoo worker placed herself in a blind to observe the chimpanzee's behaviour and found that, for five consecutive days before the opening of the zoo, Santino gathered stones from the water and placed them in the caches.
The following year, the chimpanzee added pieces of concrete to his ammunition, and was observed gently knocking on concrete rocks to break off smaller, disc-shaped pieces.
Since the initial finding, caretakers at the zoo have removed hundreds of caches.

A cache of deadly projectiles intended for human targets.

They should have had Stone Day at the zoo and issued a rock to every visitor to throw at this scheming menace.

Source.

Projectiles

Nandita Mondol, a resident of Naihati, had come to the zoo with her family and was standing near the chimpanzee enclosure along with hundreds of people when one of the primates hurled a stone at the crowd. The stone hit Mondol in her forehead and she sustained minor injuries. She was rushed to the zoo office for first aid but could not get any.


Source.