Who Am I?

[phkrause]

One day a gorilla escaped from the zoo, prompting a huge search of the district and appeals on radio, television and in the newspapers.

He was finally discovered a few days later in the city library where zoo officials found him sitting at a desk in the reading room with two books spread out in front of him.

The gorilla was deep in concentration. One book was the Bible; the other was written by Charles Darwin.

The zoo keepers asked the gorilla what he was doing. The gorilla replied: "I'm trying to figure out whether I am my brother's keeper or my keeper's brother."