One day an ape escaped from the zoo. They searched for it everywhere. They announced his disappearance, but no one reported seeing the ape.
At last, he was discovered in the public library. Officials of the zoo as well as the animal handlers went there as soon as possible.
They found the ape sitting at a desk with two books spread out in front of him. It was reading with great concentration. One book was the Bible and the other written by Darwin.
The zoo keepers asked the ape what he was doing. The ape replied, "I'm trying to figure out whether I am my brother's keeper or whether I am my keeper's brother?"