Possible Clues:

• Publisher takes point from one the Poles - they tend to be black and white
• Writer using wrong books
• Bars books?
• 'Mr. Popper's '
• Using new enclosure initially for birds
• Flightless birds
• See 49-Across
• Writer from play using The Birds
• They might speak volumes for life at the Pole - there you have it in black and white