One day an ape escaped from the Bronx Zoo. They searched for him
everywhere, in every borough. They announced his disappearance on the
radio and television as well as the newspapers. But, no one reported
seeing the ape.

At last, he was discovered in the New York Public Library. Officials
of the zoo as well as the animal handlers were summoned to the
library. They found the ape sitting at a desk in the reading room with
two books spread out in front of him. The ape was reading with great
concentration. One book was the Bible; 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."