Lets start by clearing up yesterday's mystery. There were lots of good guesses and lots of fun in the comments yesterday. As it turns out the man was a fingerprint clerk for the government. As it turns out, back in the day, clerks were expected to memorize the fingerprints. Since there were no computers, people would have to look at prints from a crime scene, and try to remember them from the gazillions on file. People were hired for having peculiar memory skills.
OK, for today, what was this mans job. I will give you a hint . . . he built cages, but what was he trying to catch?