Tricky Monkey

Wired discusses a zoo chimpanzee's apparent planning for a sneak attack on visitors:

As a zoo guide led visitors toward Santino’s island compound, the chimpanzee began to engage in a typical dominance display: screeching, standing on two feet, and carrying a stone in his hand. The guide and the visitors retreated before Santino began hurling the stones, and then advanced again for a total of three approaches. When the people returned about 3 hours later, Santino advanced toward them, holding two stones, but he did not act aggressively, even picking up an apple from the water surrounding the island and nonchalantly munching on it. But when Santino got within close range, he suddenly threw one of the stones. (It didn’t hit anyone.)
The next day, Santino again threatened visitors with stones, but the group again backed away to avoid being hit. Santino was then observed pulling a heap of hay from inside his enclosure and placing it on the island close to where the visitors approached. He put several stones under the hay and waited until the group returned about an hour later. Then, without performing a dominance display, Santino pulled a stone from under the hay and threw it. Later, he pulled a stone that he had apparently hidden behind a log and tried to hit the visitors with that, as well.
Over the course of the summer, Osvath and Karvonen observed repeated episodes of this behavior, and also recovered stones that Santino had hidden under hay or logs, racking up 114 days of observation. They recovered a total of 35 projectiles that Santino had apparently concealed: 15 under hay heaps, 18 behind logs, and two behind a rock structure on the island. The researchers conclude that Santino deliberately engaged in deceptive concealment of the stones, and that this was a new, innovative behavior on his part: Before 2010, Santino had never put stones under hay piles or behind logs.
This innovation, the team argues, is further evidence that Santino plans ahead for how he will react to the visitors’ approach to his compound, and that this is inconsistent with interpretations that he cached the stones for some other reason and then just happened to have them at hand when he got mad. By hiding the stones and then trying to deceive zoo visitors into thinking that his intentions were peaceful, Osvath and Karvonen argue, Santino was actually anticipating and planning for a future situation rather than simply responding repetitively to a past one.

That is pretty cool, but aren't chipmunks planning ahead when they store nuts, and dogs planning ahead when they bury bones?  I've seen dogs do lots of sneaky things.  Sometimes, I think we spend too much time patting ourselves on the back for being so much smarter than animals.  It tends to make us underestimate them.