Thanks for those suggestions. A friend who is doing the quiz has thrown some of the questions in my direction including the one in the original post here. She is slowly working her way through it but No 100 has me intrigued. Apparently all the answers are existing real or fictional names, nicknames, titles of films, plays, songs etc and phrases, lyrics and quotations. She tells me that she has gorillas, apes and elephants already but the answers can contain a generic term like horse or a specific one like stallion.