Good news: They are like us — They can plan for the future.

Bad news: They are like us — They demonstrate this by stockpiling and fabricating weapons.

Planning of the Apes: Zoo Chimp Plots Rock Attacks on Visitors

Over the years, Santino’s operation has become increasingly sophisticated, Osvath says, progressing from simple gathering to fabrication. He has been observed chipping away at the concrete rocks on the island with his hands to sculpt dessert plate–size discs to launch at zoo visitors.