Corrected entry: When Caesar liberates the monkeys/apes from the zoo, they seem to have become just as intelligent as the apes who inhaled the "medicine", but they didn't and should be acting as normal animals. Instead, they take the metal bars and become fierce warriors.
fluffy82
11th Nov 2011
Correction: Those are apes from the habitat and the lab that take up the spears. The apes from the zoo are just following the alpha along where he goes. They're participating but not coordinating to the same degree as the others. That said, they are exhibiting higher than normal levels of reasoning, but that's only because they're following the example of the other apes without really understanding what they're doing or why.
Phixius ★