You had the spirit of the quote:

"The first couple questions are easy: a tiger, an elephant, a giraffe, you know. When you get up to about five or six and then when you get up to 10 and 20 and 25, they couldn't come close to answering any of those questions."

He's naming the big animals that we first learned of as toddlers, same as you attributed to him!

Tried this myself. Went about 2 minutes till I got bored.