The Elusive New Zoo Gnu Comments

When in college, my Dad, John J. Hallahan, wrote the following Limerick. I think it was published in a Boston Newspaper, probably the Boston Globe. My Dad was born in 1927, so this would have been a long time ago. I'm not sure if I have the title correct. The New Gnu There was a new gnu at the zoo, but just how new nobody knew. If we'd asked he'd have told, but we couldn't be bold, because nobody knew the new gnu.